nbcbayarea.com, twitter an facebook facebook. >> see you next at 6:00. tonight, hold the phone. donald trump shocks yet again, giving out the private cell number of one of his republican rivals on live television. a new uproar as another major candidate jumps in the race. record heat. it's summer. it's july. but this hot for this long is dangerous for millions. strangers jumping into action to save a toddler locked in a hot car. women and alzheimer's. why doctors now say women with certain early warning signs are declining twice as fast as men. the red flags you should be on the lookout for. and hacking into your car. taking control while you're driving. the alarming new video that has one major car company taking action tonight to fix a stunning problem. "nightly news" begins right now.

>> announcer: from nbc news world headquarters in new york, this is "nbc nightly news with lester holt." good evening and good luck to republican presidential contenders desperately trying to be heard above donald trump, who today again managed to provoke outrage and drive a lot of the discussion online by publicly revealing the personal phone number of opponent and senator lindsey graham. the stunt also managed to overshadow the entrance into the race today by ohio governor john kasich. trump remains atop the polls, and while some dismiss his success as short-lived and the direct result of media exposure, others wonder whether his brash approach has simply hit home with a lot of voters. tonight more on trump, john kasich's big day, and the state of the race. let's start with katy tur in south carolina. katy? >> reporter: lester, the voters at these campaign stops tell me that they do not trust politicians, they don't trust the media, but they do trust donald trump because he is

speaking bluntly to them. and they say he'll have no one to answer to, especially not the republican establishment. >> whoa. >> reporter: donald trump once again delivering his brand of firebrand politics on stage in south carolina. this time taking aim at hometown senator lindsey graham. >> then i watch this idiot lindsey graham on television today -- >> reporter: for saying this on cbs. >> i don't care if he drops out. stay in the race. just stop being a jackass. >> reporter: in return trump read graham's personal cell phone number to the packed crowd. >> 202 -- >> reporter: and while graham tweeted "probably getting a new phone," his campaign fired back. "donald trump continues to show hourly that he is ill prepared to be commander in chief." but lindsey graham wasn't today's only target. >> i see rick perry the other day, and he's so -- you know, he's doing very poorly in the polls. he put glasses on so people will think he's smart. >> reporter: trump is still

leading in the most recent national poll by double digits. but now headlines like this and this "des moines register" editorial calling for trump to end his campaign, accusing trump of "coarsening our political dialogue and cheapening the electoral process." after the billionaire questioned senator john mccain's war hero status -- >> the mccain veteran comment offended quite a number of people. do you think -- >> no, i think it was very, very accurate. and i think if you look at it it was very accurate. and you see many of these people are veterans. i love them. and we're going to straighten it out because they're living in hell right now. >> why is he more appealing to you than other candidates? >> because he's the only one who's got the guts to say what needs to be said. >> reporter: and for now the one candidate stealing all the attention as his opponent struggles to get on the radar. katy tur, nbc news, bluffton, south carolina. ♪ >> reporter: this is kasie hunt at ohio state university in columbus. while trump was handing out lindsey graham's phone number, governor john kasich

came back to his alma mater to announce he'll be the 16th republican running for president. >> we are going to take the lessons of the heartland and straighten out washington, d.c. and fix our country. [ cheers and applause ] >> reporter: kasich is the son of a mailman who went to congress and helped balance the federal budget. >> end the smoke and mirrors. end the gimmicks. >> reporter: now he's a popular two-term governor in a critical swing state who's shown he can win democratic votes. he's known for his prickly personality that would normally get plenty of attention. >> plus there's me. you know that matters, too, i think. >> what about you? >> well, i mean, i'm kind of a fun guy, you know. >> reporter: but with donald trump hogging the spotlight, it's tough to break through. kasich is so far back in polls he might not even qualify for the august primetime debate in his own home state. >> when you think donald trump, do you think politician? >> i think his golf courses. >> reporter: the national media seem to disagree. when trump announced, he got a bigger boost in

coverage than any other candidate. and a month later he's still getting 21% of the headlines. even more on network television news. only jeb bush even comes close. >> without question, donald trump is sucking the oxygen out of the room for everybody else. it's hard for anybody to get any attention, visibility, for them to talk about the issues they want as long as the focus is on the donald. >> reporter: being the last candidate to announce was supposed to give kasich a late boost to help him get into that debate, but donald trump is making that so much harder. kasich's hitting the campaign trail in new hampshire anyway and that's where it really counts. lester? >> kasie hunt, thank you. we want to turn to our political director the moderator of "meet the press," chuck todd. chuck, is trump befuddling those in the political establishment who keep predicting his campaign's going to flame out? >> well, lester, look, he's befuddling them and for a variety of reasons. the short-term impacts, stu rothen

rothenberg just talked about it. sucking up all the oxygen and attention. you'd be forgiven, for example, for forgetting scott walker announced last week. a major front-runner for the republican nomination turned into a trump afterthought. today governor john kasich one of the deepest political resumes in the field is losing the news cycle to trump and the bizarre cell phone attack on lindsey graham. and some candidates, lester, appear to be so frustrated they'll do nearly anything. rand paul actually took a chainsaw to the tax code in an attempt to remind folks he is still running. but the most befuddling aspect of trump is isn't the circus performer stunts, it's the folks that are gravitating to his candidacy. and that's what the serious campaigns are trying to figure out. they worry the more they attack and marginalize him the stronger he gets. why? because these people that support him feel marginalized themselves. the more they attack the more they embrace him. that's the problem. >> chuck todd, thanks. another big story we're following is dangerous heat. a heat wave across much of the country. yes, we know it's the middle of summer. it's supposed to be hot in july but from the gulf coast up to the

northeast it is sweltering. record heat for days now, and it is raising serious concerns for health. we get details from nbc's tom costello. >> reporter: late july and the temperatures are soaring. 16 million people under heat advisories. 95 degrees in dallas today but feels like 102. 94 in tupelo, feels like 106. 91 in hilton head, real feel of 96. in kansas city store employees worked frantically to free a child left alone outside in a sweltering car. >> baby's in the car. >> she's locked. >> another rescue in philadelphia. both children survived. but outside of houston deanie and leeland jacobson still grieve for their baby. >> and he was our everything. >> reporter: three years ago leyland dropped the older kids off at school but his routine was completely different that morning and he forgot 7-month-old luke was in the back seat until deanie called asking why he wasn't at day care. >> i was like what, what? and then i kind of just dropped

the phone and ran outside and found him. and it's just unbelievable pain that you have to go through and live with every day. >> reporter: on average, 37 children die in overheated cars each year. ten so far this year. the dangers that a car acts like a greenhouse. it can be 30 to 50 degrees hotter inside than outside. and breaking the glass can require a special tool. an emergency firefighters train for. >> children can only last in upwards of a couple minutes in this type of extreme heat. >> reporter: the advice for parents, make it a habit to put a purse or briefcase in the back seat so you'll never forget a child. if you see a child in a car alone, assume it's an emergency and call 911. seconds can mean life or death. tom costello, nbc news, silver spring, maryland. there are major new developments tonight in the investigation into that shooting rampage in chattanooga. a member of the gunman's family has been taken into custody overseas as investigators look into whether his

friends here in the u.s. knew about his deadly plot beforehand. our national correspondent miguel almaguer has the latest. >> reporter: tonight the fbi is reviewing evidence taken from this chattanooga area apartment complex where a friend of mohammad abdulazeez lives. a law enforcement official tells nbc news investigators are looking into whether at least two acquaintances of the gunman who went to buy ammunition with him knew of his intentions prior to the attack. meanwhile, a world away from tennessee, abdulazeez's uncle has been arrested in jordan. law enforcement officials tell us his uncle is a radical, and investigators are looking into whether he influenced his nephew during his seven-month stay in the middle east. nbc news has also learned abdulazeez downloaded an audio recording of anwar al awlaki the american-born cleric turned al qaeda recruiter. >> when the fbi sees individuals who are downloading these al qaeda-inspired videos

it's a clear indication they're starting to become radicalized, they're learning about the jihadi cause and potentially looking to get involved in violent activity. >> reporter: a family spokesman tells us abdulazeez was last seen by his parents tuesday during a blowout argument over his dui arrest. on wednesday the suspect rented a car and went joyriding through chattanooga with friends. thursday in that mustang convertible he launched his attack, leaving five dead. today at the white house and at the capitol flags lowered to half-staff to honor the victims. back at the army recruiting office where shots first rang out, some back to the crime scene for the first time. >> i'm honored to be back at work and wearing this uniform every day. >> reporter: tonight many trying to move forward. the investigation now on two continents while here at home still so much heartbreak. a family spokesman tells us why

the gunman was depressed he often harbored anti-american sentiment. they say when he was in his darkest moments he often talked and thought about jihad. still tonight the fbi says there remains no official link or connection to any organized terror group. lester? >> miguel, thank you. we're getting a look now at new video shedding more light on the mysterious death of a woman in police custody in texas. sandra bland was taken into custody after a traffic stop last week, then later found dead in her jail cell. authorities had said she hanged herself. but her family is demanding more answers. nbc's john yang reports. >> do you have a driver's license? >> reporter: the texas state police dash cam video shows a routine traffic stop for failing to signal a lane change. >> do you mind putting out your cigarette, please? >> reporter: escalating into a confrontation that lasted about 15 minutes. nbc news edited the exchange. >> get out of the car! >> reporter: they go out of view of the camera. the dash cam picks up bland's voices also heard on this video

shot by a bystander. >> you just slammed my head to the ground! >> reporter: bland was arrested on the charge of assaulting an officer. >> i can't wait till we go to court. i cannot wait till we go to court. >> reporter: state officials are investigating his behavior and have placed him on desk duty. bland's sister says she hasn't been ready to see the tape. >> her impact in this last week is far beyond what any of us could have thought. and she's going to rest well. >> reporter: late yesterday authorities released security video of the corridor outside bland's cell. they say it shows that no one entered the cell between 7:05 a.m. when staff spoke with her and 8:58 when she was found dead. today sheriff glenn smith took us down that hallway and into cell 95. >> this cell is just like it was. >> reporter: including bland's untouched meal from the night before. on a bunk a bible and a booklet, "101 ways to find

god's purpose in your life." officials say they found her slumped down behind this partition. around her neck, a trash bag from this trash can. the other end affixed to this upright. >> reporter: as bland's family continues to seek answers about her death, they're preparing to lay her to rest this weekend in chicago. john yang nbc news hempstead, texas. we've got a lot more to tell you about tonight. ahead, startling new information about alzheimer's. doctors now say women with early symptoms are declining much faster than men. and the red flags they say you should be looking for. also the shocking video as hackers take control of an suv while a driver is going 70 miles an hour on the highway. a major car company now moving to fix a big vulnerability just exposed.

it's estimated that over 5 million americans are living with alzheimer's disease, and that number is expected to nearly triple by 2050. and doctors are out with some stunning new findings tonight. they say women with early signs of alzheimer's show a much faster decline than men. nbc's stephanie gosk has details. >> reporter: alzheimer's is a frightening disease for everyone. but now women may have even more reason to be concerned. a new study shows women with possible early signs of alzheimer's lose brain skills twice as fast as men. >> women in particular are very vulnerable in this

stage. and that's important to know because that's a great place to start treatment early. >> were they friends of dad? >> reporter: charlotte russell watched her husband die of alzheimer's. >> the day we found out i got in the car and i just -- lord, what is going on? first my dad, then my mother, now my husband. >> reporter: with that kind of family history both she and her daughter chris have joined the alzheimer's prevention registry. >> i see myself wondering when i forget something that the normal person forgets, oh, am i getting alzheimer's already? >> reporter: there are no drugs proven to reverse alzheimer's, but experts do suggest activities to slow down the progression of dementia. regularly challenge the brain. engage socially as often as possible. stay active. also important is distinguishing between normal memory problems and more serious decline. here are just a few red flags. repeatedly asking the same question. forgetting common words like maybe calling a bed a table. or sometimes getting

lost driving to a place you have driven to many times before. researchers don't know why women at risk of developing alzheimer's decline faster than men. but the hope is that this new information will trigger more targeted research. >> i don't want my children to end up with it. i don't want them to see me with the disease. >> reporter: and the science will move closer to finding a cure. stephanie gosk, nbc news, new york. up next here tonight, turns out dads gain baby weight too. the new findings that surprised even the doctors.

this next story is about one of those threats that we may have thought existed only in theory, someone hacking into a car and taking control. now the shocking new video out tonight showing just that. proving it can happen. computer experts remotely hacking into an suv on the highway, all with a laptop from the comfort of their couch. now it has a major carmaker offering a fix to a stunning

vulnerability. nbc's hallie jackson reports. >> reporter: what started as an ordinary highway drive -- >> i can't see anything because -- >> reporter: -- quickly turned terrifying for andy greenberg. >> hold on tight. hold on. >> reporter: as hackers remotely took control of his 2014 jeep cherokee, sending him into a ditch. greenberg, a reporter for "wired" magazine, did this on purpose working with cyber security experts, hackers, to show how some connected cars can be vulnerable. >> it ceased to be fun. so i can only imagine if the same thing was done to you without any forewarning whatsoever, how much fear that could instill in someone. >> reporter: the hackers in the "wired" article accessed the jeep through its infotainment system to change the radio and the ac and in a much more dangerous move to kill the engine. >> you've got to turn the car off. >> reporter: the two researchers believe that as many as 471,000 vehicles are potentially vulnerable. they've only verified that on a 2014 jeep cherokee. >> reporter: chrysler, which owns jeep, released a software

update this month and says it has a team focused on identifying and implementing software best practices including cyber security for all vehicle content including on-board and remote services. just today a bill introduced in congress would require that connected cars protect drivers against cyber criminals and have technology that could stop a hack in realtime. >> as cars become more connected it does introduce more ways of sort of getting into the vehicle. and it's something for automakers to take a closer look at. but they are take a look within themselves to beef up security. >> reporter: staying safer on the road, keeping hackers out of the driver's seat. >> on the highway. >> reporter: hallie jackson, nbc news, los angeles. moms know having a baby can mean added pounds. well, it turns out dads gain baby weight too, sort of. researchers from northwestern university studied over 10,000 men from childhood through adulthood and discovered that when men in the study became fathers they gained 3 1/2 to 4 1/2 pounds. those without children

actually lost weight. the study says having kids cuts down on exercise time and changes what food is around the house. so watch out for those snacks, guys. when we come back, making a difference by coming together to rescue american treasures in need.

"flying gun." how it got one college student in trouble with the law. ===jess/vo=== plus: families burned out of their homes, and blamng police. why they think officers could have prevented the fire.

===next close=== next. finally tonight, a different way to spend summer vacation. not sitting at a beach but instead volunteering for a mission to save american treasures before they disappear. that's exactly what one special group is doing. and nbc's harry smith shows us how they're making a difference. >> reporter: at a broken-down ranch high in the colorado rockies a circle of volunteers start to channel their inner builders. soon they are hard at it, nail guns a-blazing, saving this place from further ruin. >> to be here looking at these hills and these mountains and being able to do something for this place to save it, it's great. >> reporter: this historic preservation isn't performed by artisans and architects but by ordinary people. it's called historicorps. >> coming up. >> and the best part is even if you don't know a claw hammer

from a skill saw all that's really required is a good attitude. >> i've done things that i have never done in my whole entire life. it's great. >> reporter: fixing up a remote fire tower, rebuilding a gold rush mining complex. shoring up a crumbling courthouse. historicorps has worked on scores of projects across the country. >> i just have this tremendous satisfaction with saving a piece of history that would have been lost. >> reporter: this old ranch, first settled more than 150 years ago, is being converted into the rocky mountain land library, a place for folks who love the west to come read and study. >> do you think you would have been able to save these buildings without historicorps? >> i would say absolutely not. >> reporter: many volunteers happily sacrifice their vacation time. >> i don't think i've ever spent a week's vacation doing anything more fulfilling. >> reporter: volunteers doing historic preservation. maybe they should call it habitat for the humanities.

harry smith, nbc news, south park, colorado. that will do it for us on this tuesday night. i'm lester holt. for all of us at nbc news, thank you for watching and good night. people who lived here say police didn't do enough to stop an right now at 6:00 the blame game. people who lived here say police didn't do enough to stop an arsonist from setting the fires that put them out on the street. good evening and thanks for being with us i'm raj mathai. >> and i'm jessica aguirre. tough questions for police in san jose tonight after an arson attack at an apartment complex. six families are homeless tonight, one man is in jail. outraged residents say if police had acted differently, they would still have a place to call home. in a story you'll see only on nbc bay area robert handa joins

us live from the apartment complex in san jose. robert police confronted this man less than an hour before he allegedly set these fires. >> reporter: well jessica, that is whant tenants say. right now tenants here at the apartment at 336 north 5th street are confronting a very uncertain future. they say a fellow tenant started this fire here saturday night, but not until after the suspect had a confrontation with police earlier. they say if the man had been arrested in the initial confrontation, they wouldn't be homeless tonight. residents say the apartment fire started in this upstairs unit allegedly by the tenant currently in jail identified as craig morales. pictures show roaring flames that left six families homeless but residents say an hour before the fire erupted, they had called police because they say morales was high on drugs and ranting publicly. he first threw furniture at responding officers. >> he threw some