if here in order to hopefully recover? >> it usually drops you by a degree fahrenheit every three to four minutes. >> reporter: there have been nearly 700 heat-related emergency calls in the phoenix area for june and july alone. it's not just people in arizona weathering extreme heat. the mercury is skyrocketing from mississippi to california, fueled in part by climate change. texas is on track to have one of its hottest summers evever. elel paso has s seen morore tha month off tememperaturess oveve degrees. yesterday in las vegas, several delta passengers were overcome by heat while waiting on the tarmacac. the outside temperature was 114. the flight was canceled, and the company issued an apology. >> if you're outside and you start to feel like you're getting a heat-related illness, maybe throw cool water on you, okay? and then if you have a fan, that's great. >> reporter: it's so hot here in phoenix, paramedics are also injecting patients with ice-cold saline to save their lives.

and a new study estimates extreme heat nationwide will create an additional $1 billion in health care costs this summer alone, norah. >> wow. jonathan vigliotti, stay safe out there. thank you very much. for more on this dangerous heat, let's bring in meteorologist chris warren from our partners at the weather channel. good evening, chris. >> good evening, norah. this prolonged and extremely dangerous heat wave likely to stick around for several more days. in fact, the heat dome expands throughout a big portion of the u.s. with potential record heat going from coast to coast. more storms and the potential for damaging winds and some serious flooding not just possible but likely in these areas in yellow. we're going to see a couple of rounds of storms from this evening into the morning hours with the potential for thunderstorm after thunderstorm developing overnight during the nighttime hours. the potential for flooding is serious by morning in parts of

kentucky and tennessee. and that canadian wildfire smoke, norah, is going to be sticking around with no significant improvement in the air quality. >> all right. chris, thank you. tonight the inspector general's office has opened an investigation into allegations of abusive treatment of migrants trying to cross the southern border. the department of homeland security calls the report troubling and, if true, cruel and inhumane. here's cbs's manuel bojorquez. >> reporter: there was outrage when texas installed these floating barriers along parts of the rio grande to prevent crossings. critics say migrants could get stuck beneath and drown, and they say razor wire installed along the river has led to injuries among migrants. the deterrents are part of republican governor greg abbott's operation lone star. >> texas has had to take unprecedented steps in responding to the crisis caused by the biden administration on the border. >> reporter: but detailed concerns about the operation's tactics are now coming from within. in an internal email dated july

3rd, a state trooper wrote, i believe we have stepped over a line into the inhumane, listing examples. we were given orders to push the people back into the water to go to mexico, adding, there was the very real potential of exhausted people drowning. he added, due to the extreme heat, the order to not give people water needs to be immediately reversed as well. >> my first impression was that it's just barbaric. >> reporter: democratic congressman joaquin castro is urging the biden administration to intervene. >> no matter where you stand on the issue of immigration or border secucurity, t there's a difference between wanting border security and c carrying t polilicies thatt could lead to peopople's drownwning deaths. >> repeporter: thehe texas departmement of publilic safety telllls cbs newews its office o inspector general is investigating the trooper's allegations but stressed the department has no policy instructing troopers to withhold water from migrants or push them back into the river. in a statement, governor abbott

also said his operation has given no order that would compromise the lives of migrants. all of this is happening as the number of border apprehensions dropped last month to just over 100,000. that's the lowest since the start of the biden administration. norah. >> manny bojorquez, thank you. the search for evidence in the gilgo beach murders on new york's long island has expanded as far away as las vegas. police there said today they are reviewing all unsolved cases to see if there's a connection to suspect rex heuermann. the "las vegas review journal" reports the 59-year-old architect owns a time share property in the city. the suspected serial killer is charged with murdering at least three of 11 victims found near gilgo beach. tonight more than 6 million americans age 65 and older are living with dementia. now a groundbreaking new study reveals how hearing aids could reduce cognitive decline for adults at the high risk for the debilitating condition. krbsz news chiefs medical

correspondent dr. jon lapook has this eye-opening look. >> it's a delight to be here. >> reporter: pastor sam marts has been a minister for 61 years. listening is a job requirement. >> i have people that i know that can't hear well, and they drop out of a conversation. well, as a minister, i can't do that. >> reporter: marts participated in a study out today showing hearing aids may reduce cognitive decline in older adults at high risk of dementia. study co-author dr. franklin. >> you know, i think in the past, it was like, hearing loss doesn't really matter, so why bother? i think it's showing it really does matter. it makes a big difference. >> reporter: the study looked at nearly 1,000 people between 70 and 84 years old with untreated hearing loss and found that in the group using hearing aids for three years, cognitive decline slowed by 48% for those with increased risk factors for dementia such as diabetes, hypertension, and living alone. there was no significant change

in those not at high risk. >> when we saw a 50% reduction, we were -- we were sort of blown away and surprised. >> reporter: aside from its link to dementia, hearing loss has other detrimental effects on health, such as an increased risk of falls, depression, and social isolation. >> we have two children, seven grandchildren, and six great-grandchildren with two on the way. so i have a future, and i want to hear what family says. >> reporter: dr. lynn says people wait an average of seven to ten years before seeking help for hearing loss. he points out that in addition to getting your hearing tested by a professional, you can now screen yourself using an app on your phone. norah. >> this is such an important story. dr. lapook, thank you so much. the "cbs overnight news" wiwill be righght back.

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finding last-minute rentals in the summer can be tough, but that's not the case this year

with some vacation hot spot rentals sitting empty, even after being fully booked in years past. well, in tonight's money watch, cbs's meg oliver reports on how you can find a deal with the rise in summer vacancies. >> reporter: here along the jersey shore, the summer vacation season is in full swing. but the rental market is telling a different story. >> have you ever had a problem renting out your house? >> we've never had a problem renting, not like this. >> reporter: this man and his wife have successfully rented out this beachside home for almost two decades. during covid and up until last year, he says demand was through the roof, allowing them to raise prices and fully book. >> so how many weeks do you still have open to rent? >> we've got about two. >> reporter: that's only after cutting prices. across the country, popular summer vacation spots have all seen a decline in occupancy compared to last year. jamie lane is the chief economist at air dna. he says an uptick in international travel and new

rentals on the market have created more options for renters. >> we're seeing competition heat up. it's definitely moving more towards a renter, a guest market. >> reporter: industry experts say there's still time to get a deal. look for last-minute discounts. negotiate rent prices and don't book weekend stays. new jersey realtor jeannie wheat says this five-bedroom home a block from the beach, which rents for $9,000 a week, should be fully booked by now. >> i'm still getting calls for availability for july and august and even into september. >> reporter: meg oliver, cbs news, man as squot, new jersey. there's a new development

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jackpot is now up to $640 million with an upfront lump sum topping $328 million before the government takes its cut. we're hearing from that australian man who was rescued at sea with his dog. that's next. we end tonight with an update on the australian sailor at the center of a remarkable story of survival. 54-year-old timothy shaddock and his dog, bella, stepped onto dry land in mexico today for the first t time since april. theyey were rescued l last weee the c crew of a tunaa boat in t pacific ococean. ththey were strandeded after a m damaged their boat and knocked out their electronics.

shaddock says he couldn't have survived without his brave and furry first mate. >> she's -- she's amazing. i mean that dog is -- it's something else, you know? i'm blessed. >> shaddock says he's grateful to the crew that rescued him, and now he's planning to return back home to australia. and that's the overnight news for this wednesday. be sure to check back later for "cbs mornings." you can follow us online at cbsnews.com. reporting from right here in the nation's capital, i'm norah o'donnell. this is "cbs news flash." i'm shanelle kaul in new york. michigan's attorney general has charged 16 republicans in a

scheme to overturn donald trump's 2020 loss. the charges allege they submitted fake certificates claiming to be legitimate electors for donald trump despite joe biden winning that state. johnson & johnson is the latest drugmaker to sue the biden administration. it wants to block a program included in last year's inflation reduction act that allows medicare to negotiate lower drug prices. and the fight for taco tuesday is over. taco john's, the chain that says it trademarked the phrase, says it's now abandoning its legal battle against taco bell because of steep fees. for more, download the cbs news app on your cell phone or connected tv. i'm shanelle kaul, cbs news, new york. >> announcer: this is the "cbs overnight news." we want to begin with the

extraordinary news that the former president of the united states, donald trump, is facing another potential federal indictment. we learned today that trump got a warning in the form of a target letter, informing him that he is the target of the investigation for his efforts to overturn the 2020 election results. and that led to the chance to testify before the federal grand jury that is meeting right here in washington, d.c. and this criminal case comes amid an election season that is already heating up. sources tell cbs news that it was just hours ago that trump called house speaker kevin mccarthy to try and talk about strategy on how to defend the former president. it was just last month that trump became the first president in american history, current or former, to be criminally charged by the department of justice, and that was for his alleged mishandling of classified documents. the historic nature of today cannot be overstated. cbs's robert costa has been following the investigation from the beginning, and he'll start

us off tonight from outside the department of justice. good evening, robert. >> reporter: good evening, norah. for the second time in just two months, former president donald trump receiving a target letter from special counsel jack smith, signaling a possible indictment. all of this about the aftermath of the 2020 election. the former president confirmed the development on social media, lashing out at the special counsel, calling him deranged and revealing he was given four days to report to a grand jury, saying an arrest and an indictment were expected. >> the special counsel would not have sent a target letter and would not be apparently poised to actually bring a prosecution against former president trump if he didn't think he had a winning hand. >> reporter: although it is unclear which specific charges trump could face, his refusal to concede the 2020 election, false claims of election denial, and push for allies to fight to keep him in office, including on january 6th, are

well-documented. >> the capitol was invaded. the electoral count was halted. and the lives of those in the capitol were put at risk. >> reporter: witnesses from trump's inner circle have testified that trump applied pressure to a sprawling group of stakeholders as he fought to stay in power, including his own vice president, state election officials, members of congress, and leaders at the justice department. the question now is whether trump's latest legal troubles create an opening for his trailing republican rivals. >> reporter: i'm ed o'keefe in south carolina, where florida governor ron desantis was peppered with questions about the news. >> governor, does the former president's legal issues disqualify him? >> reporter: he said this about trump's behavior during the capitol attack. >> i think it was shown how he was in the white house and didn't do anything while things were going on. he should have come out more forcefully. of course that. but to try to criminalize that, that's a different issue entirely. >> reporter: the governor came here to be the first to file

paperwork for the state's primary next year. >> we're going to make this official. >> reporter: but yet again, it's the former president's legal challenges that are dominating the discussion, and he seems to gain support every time this happens, something another of his opponents, nikki haley, commented on today. >> the rest of this primary election is going to be in reference to trump. it's just going to continue to be a further and further distraction. >> reporter: back in washington, the grand jury continues to meet this week. and for now, trump is not expected to appear. meanwhile, michigan's attorney general announced today charges against 16 fake electors, people who signed documents falsely claiming that trump had won the 2020 election in that state as part of a plot to keep him in power. all of this underscoring how the heat is on trump and not just here in washington. norah. >> and there is still much more to learn. robert costa, thank you for your new reporting.

now to the disturbing news of an american soldier being held in north korea. cbs news has learned that u.s. army private 2nd class travis king willfully crossed over the demilitarized zone between south korea and the north during a tour. cbs's margaret brennan reports this is the first time an american citizen has been detained by north korea in nearly five years. >> reporter: it was here along the heavily fortified border where travis king, a u.s. army private 2nd class, dashed across. a witness told cbs that king suddenly yelled out, ran in between two buildings, and then into north korea. defense secretary lloyd austin. >> one of our service members, who was on a tour, willfully and without authorization crossed the military demarcation line. we believe that he is in dprk custody. >> reporter: a week prior, king had been released from a detention facility in south korea.

he was escorted to the airport outside seoul to fly back to fort bliss, texas. but instead of boarding the plane, he got on a tour bus to the dmz. >> the safety and security of any american overseas remains the top priority. >> reporter: securing king's release is complicated. the u.s. does not have diplomatic relations with pyongyang. the last american civilians to be detained there were freed in 2018. otto warmbier, a college student, died shortly after his 2017 release. since king is a soldier, the defense department said it is taking the lead by communicating with military counterparts. but tensions there are high. today the first u.s. nuclear-capable submarine in four decades arrived in south korea, part of the biden administration's push to deter kim jong-un's continued nuclear development. and north korea fired off a suspected ballistic missile just days after testing one that could put the u.s. within striking distance of a nuclear weapon. over the past two years, the kim government refused repeated offers by the biden

administration to negotiate without preconditions specifically regarding its nuclear program. as of this evening, pyongyang has not responded, norah, to any outreach, including about private king. >> margaret brennan, thank you. the search for evidence in the gilgo beach murders on new york's long island has expanded as far away as las vegas. police there said today they are reviewing all unsolved cases to see if there's a connection to suspect rex heuermann. the "las vegas review journal" reports the 59-year-old architect owns a time share property in the city. the suspected serial killer is charged with murdering at least 3 of 11 victims found near gilgo beach. nearly 27 years after the murder of hip-hop legend tupac shakur, las vegas police confirmed today they executed a search warrant on monday in connection with the case. police searched a home in the city of henderson. that's about 15 miles southeast of the vegas strip. shakur was at a red light just a

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i'm willie james inman in washington. thanks for staying with us and happy wednesday. ukraine's summer offensive continues to make small but steady progress against russian forces. moscow's troops have had months to dig trenches, erect tank traps, and plant thousands of mines across the 600-mile front line. clearing those mine fields to allow troops and equipment to roll through is the job of specially trained soldiers. charlie d'agata joined them on patrol. >> reporter: they are the hidden danger, and they are everywhere, far more than anyone expected. now every single day, troops like these put their lives on the line to help save others. we need to warn you this story contains images some might find disturbing. they're called sappers. the mine hunters of the 35th marine brigade. retreating russians have laid land mines everywhere. commanders say it's the number one reason penetrating russian defenses is such a slow grind. and even though this is strictly

an exercise for our benefit and these real mines have been defused, it's still terrifying. a forward team cuts a path only about two yards wide, gradually widening it so troops and equipment can cut through the mine field. but russians have been known to fire rockets contaiing smaller mines like these, sometimes called petal minds or butterfly minds, re-mining an area that had already been cleared. not just the sheer number of mines but mines of every description. anti-tank, anti-personnel, cluster bombs, ieds, call sign mr. brown shows us. one mine springs out of the ground four feet high and sprays 2,500 fragments in a 50-yard radius. >> which one scares you most? "this one which is rare," he says. if the trip wire is activated, you can die on the spot. but those are the most scary

ones. six of our sappers have lost their legs to it. using metal detectors is not only dangerous. it's painstakingly slow, which is why they'd like more of these. american mine-clearing line charges that can clear a 10100-yard path in one spectacur blow. troops say equipment like this u.s.-supplied bradley fighting vehicle have saved lives, able to withstand anti-tank mines, until they step outside. one unlucky soldier trips a mine. he lost a leg, but he survived. call sign odessa lost most of his foot and a few fingers to a mine, yet he's back on the job. >> what does it take to be a sapper? [ speaking in a global language ] >> reporter: "a lot of training because one step left or right can always be the last one," he says. "it's very hard but fun at the same time."

and it's not just the land mines themselves. they say a lot of them are booby trapped like putting a grenade under a tank mine. they remove it. both explosives go off, killing or wounding anyone near it. it's not only sappers that lose their limbs in this war. holly williams visited an american finance clinic where doctors are helping those wounded warriors put their lives back together. >> reporter: they signed up for the military two months after russia invaded her country. a radio operator, she celebrated her 19th birthday on the front line. but then in february, her unit came under mortar fire, and it tore off her left leg. >> did you realize immediately that you had lost your leg?

>> yeah. >> what did you feel at that point? >> i grabbed my leg and realized i was holding it in my hand, just a bone, she told us. i needed to give myself first aid. it was scary. it was painful." we met ruse lana just four days after she was fitted with a new prosthetic. no longer on the battlefield but still a fighter, she was already pushing herself to the limits. she told us she planned one day to dance again. ukraine says more than 10,000 of its people have lost a limb during russia's bloody invasion. a generation scarred for life. the superhuman center set up far from the front line is ukraine's first state-of-the-art clinic for prosthetics and rehabilitation. they started treating wounded

warriors here even while construction workers finished the building. >> if you look at what russia has done in ukraine, it's barbaric. >> reporter: the superhuman center is funded by the howard buffetett foundadation. he's's the son of the bilillion warren buffefett a and sayss hi charityy has g given ukraiaine y $3$300 millionon since t the in began. and buffett's visited the country seven times during the war. >> what are your impressions of ukraine and ukrainians? >> well, i think ukraine is actually teaching the world a lesson. i think they're teaching us the kind of commitment and resiliency and fight that can be mustered up against somebody like russia. >> reporter: dennis will need every ounce of resilience he can muster. a triple amputee who told us he lost both legs and his left arm

to an anti-tank rocket. but this former infantry soldier is so driven, his doctors believe he'll one day be able to run again. "we can't give up," he told us. "we have a long life ahead of us, and we should take fate by its horns." just like ukraine, ruslana and denis never wanted this war, and it's left them shattered. yet like they're country, they're unbroken and undefeated. holly williams, lviv, ukraine. the "cbs overnight news" will be right back.

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ready or not, artificial itelligence is gaining a foothold in the field of medicine. it's being used to detect rare genetic disorders, help als patients speak, and even diagnose some potentially deadly diseases. but a.i. also gets things wrong, so canan itt be reliedd on?? here's dr. jon lapopook. >> initiatating the holographic emitter array. >> reporter: there was a time when holographic doctors -- >> restate the nature of the medical emergency. >> reporter: -- were purely the stuff of science fiction. in 2 2017, i metet with actctor pichardodo, who played the emergegency medicical holograra star trekk to talk about how medicine might one day meet science fiction. >> do you think that eventually in the future, a computer algorithm could entirely replace a physician? >> that artificial intelligence physician will be created from the personal experiences of a large group of doctors. so, yes, i believe the day w wi comeme when youou willl bee obs

>> i i'll takee care of this. >> reporter: six years ago, pichardo's prediction seemed farfetched. but how about now in this age of a.i.? i asked peter lee, microsoft's vice president of research and incubations. >> openai has said that chatgpt 4 has scored something like in the 90 percentile on the bar. should we be concerned in health care that these computers are going to replace us in some way? >> absolutely not. and by the way, gpt-4 also getting 90% on the u.s. medical licensing exam. this is a medical tool. it's not a human being, but it's not a computer like we're used to. >> reporter: lee considers artificial intelligence to be a powerful tool that could dramatically improve patient care and cut down on one of the biggest complaints in health care -- paperwork. >> primary care physician will spend about 40 to 45% of their working day writing clinical notes and filling out prior

authorization forms. the hope is it will allow doctors and nurses to again make eye contact and be present with their patients. >> i'm sorry, dave. i'm afraid i can't do that. >> reporter: but judging by its portrayal in movies and tv, a.i. has some convincing to do. >> i know that you and frank were planning to disconnect me. >> is it developing some sort of machine consciousness? >> they don't have a consciousness, but they are learning from all of us. >> reporter: i wondered if a.i. had already learned what a human practitioner has to do all the time, figure out what's important and what's not. >> how old would you like to be for today's visit? >> so let's say i'm 50 years old, mildly elevated blood sugar. >> okay. >> i have a belly ache. it comes and goes. >> reporter: physician assistant andrea barrett demo'd for us the dax express, microsoft's artificial intelligence technology designed to capture and summarize a patient encounter. >> my toes are numb every now and then, yeah. i've had that for years.

>> all right. is one leg worse than the other? >> no, both. ever since i was in australia and i was in a white water rafting accident and i ended up tearing my acl in my knee when i hit a rock that was submerged. >> okay. did you have it replaced? >> no. no. the rock stayed the same. it was really hard to get it out of the stream. >> reporter: as it turned out, it did recognize that my knee injury had nothing to do with my belly ache and placed that piece of information in a separate part of the summary. >> as you see, it did take out that joke that you said about the rock. >> so it figured out that when i bashed my knee whitewater rafting in australia, it had nothing to do with the abdominal pain. >> correct. >> that's impressive that it was able to filter out a lot of the sort of extraneous banter back and forth. >> yep. as the clinician. you can decide if you want that included. >> reporter: but there are also concerns about what the technology might leave in. >> there's an expression that a.i. machines can hallucinate.

what does that mean? what does it refer to? >> so it refers to the possibility that the a.i. system might provide answers that aren't completely correct. >> reporter: lee says scientists are working on the equivalent of a lie detector for machines, based on finding unusual patterns of computer signals. >> sometimes they're defensive, these computers, right? they double down on the mistake? >> once the thing thinks a certain line of reasoning is the right one, it can get stuck in that line of reasoning. >> wait. computers can be stubborn? >> they can remind us as human beings of some of our own foibles. but these are just machines. they're just tools. >> that was

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it''s comiming along.. well, it c can. national u university.y. supppporting thehe whole y. towns and cities across the continue to set temperature records. but europe is also sweltering. chris livesay is there. >> reporter: fires sear through the greek seaside, forcing tourists to evacuate from at

least six different towns. once a vacation oasis now reduced to ashes. in italy, temperatures could surpass 120 degrees, breaking the european heat record the country set just two years ago. rome is setting up 28 heat help points like this one as tourists have been collapsing under the sun. the latest heat wave is called karen, named after the greek deity who ferried souls across the river stix and into the underworld. outside st. peter's basilica in vatican city, the answers to the hellish heat are many. but only one soothes both body and soul, says helen kelly from australia. >> water. beautiful, cool, holy water. >> reporter: humans, of course, aren't the only victims of the extreme heat and climate change. a new study says italy's famed

prosecco sparkling wine could be wiped out due to soil degradation and drought. and in the animal kingdom, gorillas turn to ice treats at the berlin zoo after germany issued heat warnings in nearly half the country in recent days. with the u.n. warning the blistering temperatures will likely continue into august. for cbs mornings, chris livesay, rome. and that's the overnight news for this wednesday. for some of you, the news continues. for others, check back later for "cbs mornings" and follow us online anytime at cbsnews.com. reporting from the nation's capital, i'm willie james inman. this is "cbs news flash." i'm shanelle kaul in new york. michigan's attorney general has charged 16 republicans in a scheme to overturn donald trump's 2020 loss.

the charges allege they submitted fake certificates claiming to be legitimate electors for donald trump despite joe biden winning that state. johnson & johnson is the latest drugmaker to sue the biden administration. it wants to block a program included in last year's inflation reduction act that allows medicare to negotiate lower drug prices. and the fight for taco tuesday is over. taco john's, the chain that says it trademarked the p ase, says it's now abandoning its legal battle against taco bell because of steep fees. for more, download the cbs news app on your cell phone or connected tv. cbs news, new york. tonight, the legal trouble for donald trump grows. the former president reveals he's the target of another federal investigation. could he soon be indicted for a third time, this time for

election interference? here are tonight's headlines. what does it mean to receive a target letter, and how soon could trump face more charges? the reaction tonight from fellow republicans. >> the american public is tired of this. an american crossed the border from south korea and was taken into custody by the north. >> the american who crossed into north korea is a u.s. soldier. >> the man evaded military escorts who were trying to send him back to the u.s. for disciplinary reasons. >> what an eyewitness tells cbs news happened. millions of americans are urged to stay inside as potentially deadly heat refuses to loosen its grip in a big part of the country. >> residents here in california are being urged to conserve their air-conditioning use to help avoid a potential blackout. >> making matters worse, the air quality is bad for millions in the east and the midwest due to the smoke from those canadian wildfires. important news about your health.

a new study reveals hearing aids may cut your risk of dementia in half. >> that has a massive impact on public health and society. get your lottery ticket. the powerball jackpot hits $1 billion. >> it is the cheapest entertainment $2 can buy. >> announcer: this is the "cbs overnight news." we want to begin with the extraordinary news that the former president of the united states, donald trump, is facing another potential federal indictment. we learned today that trump got a warning in the form of a target letter, informing him that he is the target of the investigation for his efforts to overturn the 2020 election results. and that letter offers the former president a chance to testify before the federal grand jury that is meeting right here in washington, d.c. and this criminal case comes

amid an election season that is already heating up. sources tell cbs news that it was just hours ago that trump called house speaker kevin mccarthy to try and talk about strategy on how to defend the former president. it was just last month that trump became the first president in american history, current or former, to be criminally charged by the department of justice, and that was for his alleged mishandling of classified documents. the historic nature of today cannot be overstated. cbs's robert costa has been following the investigation from the beginning, and he'll start us off tonight from outside the department of justice. good evening, robert. >> reporter: good evening, norah. for the second time in just two months, former president donald trump receiving a target letter from special counsel jack smith, signaling a possible indictment. all of this about the aftermath of the 2020 election. the former president confirmed the development on social media, lashing out at the special counsel, calling him deranged and revealing he was given four

days to report to a grand jury, saying an arrest and indictment were expected. >> the special counsel would not have sent a target letter and would not be apparently poised to actually bring a prosecution against former president trump if he didn't think he had a winning hand. >> reporter: although it is unclear which specific charges trump could face, his refusal to concede the 2020 election, false claims of election denial, and push for allies to fight to keep him in office, including on january 6th, are well-documented. >> the capitol was invaded. the electoral count was halted. and the lives of those in the capitol were put at risk. >> reporter: witnesses from trump's inner circle have testified that trump applied pressure to a sprawling group of stakeholders as he fought to stay in power, including his own vice president, state election officials, members of congress, and leaders at the justice deprtment. the question now is whether trump's latest legal troubles create an opening for his

trailing republican rivals. >> reporter: i'm ed o'keefe in south carolina, where florida governor ron desantis was peppered with questions about the news. >> governor, do the former president's legal issues disqualify him? >> reporter: he said this about trump's behavior during the capitol attack. >> i think it was shown how he was in the white house and didn't do anything while things were going on. he should have come out more forcefully. of course that. but to try to criminalize that, that's a different issue entirely. >> reporter: the governor came here to be the first to file paperwork for the state's primary next year. >> we're going to make this official. >> reporter: but yet again, it's the former president's legal challenges that are dominating the discussion, and he seems to gain support every time this happens, something another of his opponents, nikki haley, commented on today. >> the rest of this primary election is going to be in reference to trump. it's just going to continue to be a further and further distraction. >> reporter: back in washington, the grand jury continues to meet this week. and for now, trump is not

expected to appear. meanwhile, michigan's attorney general announced today charges against 16 fake electors, people who signed documents falsely claiming that trump had won the 2020 election in that state as part of a plot to keep him in power. all of this underscoring how the heat is on trump and not just here in washington. norah. >> and there is still much more to learn. robert costa, thank you for your new reporting. now to the disturbing news of an american soldier being held in north korea. cbs news has learned that u.s. army private 2nd class travis king willfully crossed over the demilitarized zone between south korea and the north during a tour. cbs's margaret brennan reports this is the first time an american citizen has been detained by north korea in nearly five years. >> reporter: it was here along the heavily fortified border where travis king, a u.s. army private 2nd class, dashed

across. a witness told cbs that king suddenly yelled out, ran in between two buildings, and then into north korea. defense secretary lloyd austin. >> one of our service members, who was on a tour, willfully and without authorization crossed the military demarcation line. >> reporter: a week prior, king had been released from a detention facility in south korea. he was escorted to the airport outside seoul to fly back to fort bliss, texas. but instead of boarding the plane, he got on a tour bus to the dmz. >> the safety and security of any american overseas remains the top priority. >> reporter: securing king's release is complicated. the u.s. does not have diplomatic relations with pyongyang. the last american civilians to be detained there were freed in 2018. otto warmbier, a college student, died shortly after his 2017 release. since king is a soldier, the defense department said it is taking the lead by communicating with military counterparts.

but tensions there are high. today the first u.s. nuclear-capable submarine in four decades arrived in south korea, part of the biden administration's push to deter kim jong-un's continued nuclear development. and north korea fired off a suspected ballistic missile just days after testing one that could put the u.s. within striking distance of a nuclear weapon. over the past two years, the kim government refused repeated offers by the biden administration to negotiate without preconditions specifically regarding its nuclear program. as of this evening, pyongyang has not responded, norah, to any outreach, including about private king. >> margaret brennan, thank you. the "cbs vernight news"

>> announcer: this is the "cbs overnight news."

well, tonight more than 100 million americans are under heat alerts as scorching hot temperatures extend from california to florida. the city of phoenix set a new record today by hitting 110 degrees or more for the 19th straight day, and there is no end in sight. cbs's jonathan vigliotti reports on how some hospitals are going to extreme lengths to keep patients cool in this record-breaking heat. >> reporter: phoenix just broke a heat record set nearly 50 years ago, and even the lows are breaking record highs. monday's overnight temperature here was 95 degrees. >> all the patients we've been seeing, many of the high temperatures have been 107. we had somebody at 111 yesterday. >> reporter: emergency room dr. frank low vecchio has seen a spike in heat-related injuries, even placing some patients in ice-filled baths like this.

>> the best way to cool somebody is with a slurry of ice. so ice and water submerged in it. >> how long is a person staying in here in order to hopefully recover? >> it usually drops you by a degree fahrenheit every three to four minutes. >> reporter: there have been nearly 700 heat-related emergency calls in the phoenix area for june and july alone. it's not just people in arizona weathering extreme heat. the mercury is skyrocketing from mississippi to california, fueled in part by climate change. texas is on track to have one of its hottest summers ever. el paso has seen more than a month of temperatures over 100 dedegrees. yesterday in las vegas, several delta passengers were overcome by heat while waiting on the tarmac. the e outside tetemperature e w. the flight was canceled, and the company issued an apology. >> if you're outside and you start to feel like you're getting a heat-related illness, maybe throw cool water on you, okay? and then if you have a fan, that's great. >> reporter: it's so hot here in phoenix, paramedics are also injecting patients with ice-cold saline to save their lives.

and a new study estimates extreme heat nationwide will create an additional $1 billion in health care costs this summer alone, norah. >> wow. jonathan vigliotti, stay safe out there. thank you very much. for more on this dangerous heat, let's bring in meteorologist chris warren from our partners at the weather channel. good evening, chris. >> good evening, norah. this prolonged and extremely dangerous heat wave likely to stick around for several more days. in fact, the heat dome expands throughout a big portion of the u.s. with potential record heat going from coast to coast. more storms and the potential for damaging winds and some serious flooding not just possible but likely in these areas in yellow. we're going to see a couple of rounds of storms from this evening into the morning hours with the potential for thunderstorm after thunderstorm developing overnight during the nighttime hours. the potential for flooding is serious by morning in parts of kentucky and tennessee.

and that canadian wildfire smoke, norah, is going to be sticking around with no significant improvement in the air quality. >> all right. chris, thank you. tonight the inspector general's office has opened an investigation into allegations of abusive treatment of migrants trying to cross the southern border. the department of homeland security calls the report troubling and, if true, cruel and inhumane. here's cbs's manuel bojorquez. >> reporter: there was outrage when texas installed these floating barriers along parts of the rio grande to prevent crossings. critics say migrants could get stuck beneath and drown, and they say razor wire installed along the river has led to injuries among migrants. the deterrents are part of republican governor greg abbott's operation lone star. >> texas has had to take unprecedented steps in responding to the crisis caused by the biden administration on the border. >> reporter: but detailed concerns about the operation's tactics are now coming from within. in an internal email dated july

3rd, a state trooper wrote, i believe we have stepped over a line into the inhumane, listing examples. we were given orders to push the people back into the water to go to mexico, adding, there was the very real potential of exhausted people drowning. he added, due to the extreme heat, the order to not give people water needs to be immediately reversed as well. >> my first impression was that it's just barbaric. >> reporter: democratic congressman joaquin castro is urging the biden administration to intervene. >> no matter where you stand on the issue of immigration or border security, there's a difffference betetween wantitin border security and carrying out policies that could lead to peoplele's drownining deaths. . > reporter:r: the texasas departmement of publblic safety tetells cbs nenews its offffice inspector r general isis investigating the trooper's allegations but stressed the department has no policy instructing troopers to withhold water from migrants or push them back into the river. in a statement, governor abbott also said his operation has

given no order that would compromise the lives of migrants. all of this is happening as the number of border apprehensions dropped last month to just over 100,000. that's the lowest since the start of the biden administration. norah. >> manny bojorquez, thank you. the search for evidence in the gilgo beach murders on new york's long island has expanded as far away as las vegas. police there said today they are reviewing all unsolved cases to see if there's a connection to suspect rex heuermann. the "las vegas review journal" reports the 59-year-old architect owns a time share property in the city. the suspected serial killer is charged with murdering at least 3 of 11 victims found near gilgo beach. tonight more than 6 million americans age 65 and older are living with dementia. now a groundbreaking new study reveals how hearing aids could reduce cognitive decline for adults at high risk for the debilitating condition.

cbs news chief medical correspondent dr. jon lapook has this eye-opening look. >> it's a delight to be here. >> reporter: pastor sam martz has been a minister for 61 years. listening is a job requirement. >> i have people that i know that can't hear well, and they drop out of a conversation. well, as a minister, i can't do that. >> reporter: martz participated in a study out today showing hearing aids may reduce cognitive decline in older adults at high risk of dementia. study co-author dr. frank lin. >> you know, i think in the past, it was like hearing loss doesn't really matter, so why bother? i think it's showing it really does matter. it makes a big difference. >> reporter: the study looked at nearly 1,000 people between 70 and 84 years old with untreated hearing loss and found that in the group using hearing aids for three years, cognitive decline slowed by 48% for those with increased risk factors for dementia such as diabetes, hypertension, and living alone. there was no significant change in those not at high risk.

>> when we saw a 50% reduction, we were -- we were sort of blown away and surprised. >> reporter: aside from its link to dementia, hearing loss has other detrimental effects on health, such as an increased risk of falls, depression, and social isolation. >> we have two children, seven grandchildren, and six great-grandchildren with two on the way. so i have a future, and i want to hear what my family says. >> reporter: dr. lin says people wait an average of seven to ten years before seeking help for hearing loss. he points out that in addition to getting your hearing tested by a professional, you can now screen yourself using an app on your phone. norah. >> this is such an important story. dr. lapook, thank you so much. the "cbs overnight news" will b be right baback.

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with some vacation hot spot rentals sitting empty, even after being fully booked in years past. well, in tonight's money watch, cbs's meg oliver reports on how you can find a deal with the rise in summer vacancies. >> reporter: here along the jersey shore, the summer vacation season is in full swing. but the rental market is telling a different story. >> have you ever had a problem renting out your house? >> we've never had a problem renting, not like this. >> reporter: rory steinel and his wife have successfully rented out this beachside home for almost two decades. during covid and up until last year, he says demand was through the roof, allowing them to raise prices and fully book. >> so how many weeks do you still have open to rent? >> we've got about two. >> reporter: that's only after cutting prices. across the country, popular summer vacation spots have all seen a decline in occupancy compared to last year. jamie lane is the chief economist at airdna. he says an uptick in international travel and new

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murder of hip-hop legend tupac shakur, las vegas police confirmed today they executed a search warrant on monday in connection with the case. police searched a home in the city of henderson. that's about 15 miles southeast of the vegas strip. shakur was at a red light just a block from the strip when he was shot multiple times. there are a billion reasons to keep your eye on the ball. powerball, that is.

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jackpot is now up to $640 million with an upfront lump sum topping $328 million before the government takes its cut. we're hearing from that australian man who was rescued at sea with his dog. that's next. we end tonight with an update on the australian sailor at the center of a remarkable story of survival. 54-year-old timothy shaddock and his dog, bella, stepped onto dry land in mexico today for the first time since april. they were rescued d last week b ththe crew of a a tuna boat ini pacific oceaean. they were ststranded afterer a m damaged theieir boat and knocke out their electronics.

shaddock says he couldn't have survived without his brave and furry first mate. >> she's -- she's amazing. i mean that dog is -- is something else, you know? i'm blessed. >> shaddock says he's grateful to the crew that rescued him, and now he's planning to return back home to australia. and that's the overnight news for this wednesday. be sure to check back later for "cbs mornings." you can follow us online at cbsnews.com. reporting from right here in the nation's capital, i'm norah o'donnell. this is "cbs news flash." i'm shanelle kaul in new york. michigan's attorney general has charged 16 republicans in a scheme to overturn donald trump's 2020 loss.

the charges allege they submitted fake certificates claiming to be legitimate electors for donald trump despite joe biden winning that state. johnson & johnson is the latest drugmaker to sue the biden administration. it wants to block a program included in last year's inflation reduction act that allows medicare to negotiate lower drug prices. and the fight for taco tuesday is over. taco john's, the chain that says it trademarked the phrase, says it's now abandoning its legal battle against taco bell because of steep fees. for more, download the cbs news app on your cell phone or connected tv. i'm shanelle kaul, cbs news, new york. hailey it's wednesday, june 19th, 2023. this is the "cbs morning news." another indictment coming? president trump claims he's now the target of an investigation