the b-22 ospreys that flew us out of syria had to refuel in the air in order to make it. i.s.i.s. may be on the run in syria, norah, but it is still alive and dangerous. a u.s. official told us that, every week, there are suicide attacks and roadside bombings in areas that were liberated from i.s.i.s. >> o'donnell: all right, david martin inside syria, thank you. in the race for the democratic presidential nomination, our latest cbs news battleground tracker shows former vice president joe biden leading the pack at 25% in states with early primaries and caucuses. political correspondent ed o'keefe joins us now and ed has been digging into these poll numbers. what do they tell us? >> reporter: after two months of polling, it appears democratic voters are starting to break up the field into three distinct groups. the first tier led by joe biden, plus elizabeth warren, kamala harris and bernie sanders also in double digits.

a second and third tier are hoping to break through but still in single digits. biden's lead is shrinking mostly because of harris and warren. who are also ahead of sanders for distinct reasons. after months of rolling out detailed policy plans after months of rolling out detailed policy plans a majority of democrats feel warren will fight a great deal for them and after a standout debate last month, harris is seen as one of the strongest in the field and one of the main reasons people are considering voting for her. >> o'donnell: and ed, what did we find out about the issues? that democrats care most about. >> reporter: healthcare, healthcare, healthcare, and voters are less concerned with how they're covered and more concerned about the cost. that's notable because these days candidates seem to be focused more on how americans get the coverage, not the out of pocket costs. we'll see how it changes in weeks. >> o'donnell: ed o'keefe, thank you. we're going to stay on the topic of healthcare because a new study finds colorectal cancer rates are rising among americans under 50 years old. colon cancer is the second

deadliest cancer behind lung cancer and when diagnosed in younger patients, it's more likely to be in advanced stages. our medical correspondent dr. jon lapook is here. jon, how concerned are you about this? >> i'm quite concerned. we've been looking at this apparent trend for years wondering if it is real, turns out this trend is real and especially worrisome because it turns out, in people under 50, colon cancer is more deadly. >> o'donnell: overall colon cancer rates are declining for those over 50, right? why the increase in younger adults? >> right well over 50 declined because of the successful colonoscopy. under 50, it has something to do with the gut microbiome, the trillions of species of bacteria in our gut linked to colon cancer. maybe we're messing up our gut

micro biome with our diet. the antibiotics and modern diet. >> o'donnell: so what are the guidelines about when you should be screened? >> people at average risk at age 50. if you have increased risk, younger than that. the current recommendation do say this for most of the societies but turns out the american cancer society is saying, in view of the recent findings, let's look at age 45 as a time to start the discussion. i think that leaves people wondering what to do and i think this is a time for informed and shared decision-making meaning you sit down with your clinician and say what are the risks and benefits and go from there. >> o'donnell: disturbing to hear about more younger people getting colon cancer. >> it is. >> glor: >> o'donnell: thank you so glad you're here. and relieve is on the way from the staggering heat that gripped the u.s. over the weekend and pushed out by potentially severe storms, watches and warnings posted from tennessee to rhode island with the greatest threat along the atlantic coast. the heat wave is blamed for nine deaths, more than 300,000 homes

homes and businesses are still without power in michigan wisconsin, maryland, and new york city. still ahead the possible break in the murders of an american woman and her boyfriend in a remote part of canada. allegations of sexual assault and misconduct at an all male college, one posted his story on social media. and new research shows how to lose up to 16 pounds, a lot easier than you think.

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dr. martin luther king jr.'s alma mater. in his post keys accused demarcus crews, an assistant dean and student housing director of unwanted touching and pinching and sexual comments. >> he always targets freshmen, and i see it every day. it just sickens me. >> reporter: you're describing something that sounds almost predatory. >> it is very predatory, yes. >> reporter: keys says morehouse never followed up when he complained in january, 2018. do you have any satisfaction at all from the way morehouse has treated you? >> i have no satisfaction. >> reporter: another morehouse student retweeted keys' allegations with his own complaints. >> i, too, was sexually harassed by demarcus crews. >> reporter: morehouse put crews on unpaid administrative leave and says it's investigating. key complained through the department of education's title ix office, it has 372 ongoing investigations into sexual harassment and violence on

college campuses nationwide. one case involved robert peterson, a former morehouse sociology professor, a student complained he gave the student alcohol and groped him on a school trip to brazil in 2015.h remain anonymous. >> they were aware of me getting >> reporter: late this afternoon, professor peterson responded to our email and denied the allegations, saying none of this happened. demarcus crews never responded. morehouse college said it will "take the necessary action to protect the safety of its students." finally, norah, michael keys has left morehouse and is looking for a new school. >> o'donnell: all right, mark strassmann, thank you. still ahead, another fan is hit by a line drive. what one team is doing to protect the crowd. and the sight that brought tears to the eyes of a firefighter. swim meets every saturday.

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>> o'donnell: police in western canada have a person of interest in the murders of an american woman and her australian boyfriend. the couple were shot to death last week after their van broke down on a remote highway known by some as the highway of tears. today police released a sketch of a man seen talking with them the night before their bodies were found. tonight a first for keeping baseball fans safe. the chicago white sox extended protective netting to both foul poles in the outfield corners. they are the first big league team to do that. a number of fans have been hurt recently by foul balls. in cleveland yesterday a line drive sent a 3-year-old boy to the hospital. the netting there stops at the ends of the dugouts. new research shows it doesn't take much to lose a lot. people just slightly over weight were able to lose 16 pounds over two years just by cutting 300 calories a day from their diets. they also improved their cholesterol and blood sugar levels.

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>> o'donnell: we wanted to end tonight with a sight that brought a brave young firefighter to tears. for the first time in his life, he saw the american flag in all its star-spangled glory. it's the most treasured symbol of our country. imagine if you couldn't see the red, white and blue. that's exactly what happened to douglas county, georgia firefighter spencer caradine. >> i never knew that there was a different red than my eyes. >> o'donnell: spencer is color blind and only reently found out, all because of his fellow firefighter jordan gardner. >> when i realized he couldn't see what i saw, i wanted to fix it. >> o'donnell: jordan ordered him a pair of special glasses and planned a big surprise on the fourth of july. >> so we all pitched in and got these.

you have to close your eyes, though. you have to come out here. >> o'donnell: overcome with emotion, spencer looks at the stars and stripes first, and then looks at everything else. >> thank you. >> o'donnell: this is what it looked like before his glasses. and now, in all its glory-- >> that look on his face, it was the best feeling in the world. >> o'donnell: and spencer caradine told us that, while he sees old glory in a new way, it has not changed what those stars and stripes stand for. and that's the overnight news for this tuesday. for some of you the news continues for others check back late erfor morning news and cbs this morning. from the broadcast center in new

york city i'm norah o'donnell. this is the "cbs overnight news." >> welcome to the overnight news i'm nikki baptiste. the people in puerto rico are up in arms involving the governor and top aides. tens of thousands took to the streets of san juan and david was there. >> reporter: the president made a surprise saying the reason he's not resigned he respected rule and order and democracy. i've got to tell you, from interviewing hundreds of people who are out here tonight, they are asking him to respect the

fact that they changed their mind and that's why they want him out. the protesters shut down a main highway that connects san juan to the rest of the island. it appeared to be the largest demonstration yet and the message was very clear, they won't stop until the governor steps down. >> our schools are really poor right now. i'm a teacher. i don't have a job right now because they're closing schools. >> reporter: what is it like for a 14-year-old to witness what is going on? >> it's really amazing. it's just astonishing to really see basically the whole puerto rico coming together as a whole. >> reporter: here's how they got here. puerto ricans already reeling from hurricane maria and a debt crisis learned that the f.b.i. arrested the former heads of the education and health insurance departments for allegedly funneling money to friends. the final straw was a trove of leaked chat messages between the governor and top aides. in one exchange, the governor's former chief financial officer says, "don't we have a cadaver to feed the crows?" that was in the aftermath of the hurricane. >> i apologize for it.

>> reporter: today the governor speaking on fox news faced one question he struggled to answer all week. >> who specifically is supporting you today? >> reporter: he named the local mayor of san sebastian. that mayor told cbs news he does not support the governor, nor does president trump, who said this today. >> look, he's a terrible governor. the congress of the united states handed him $92 billion, and that $92 billion is in the hands of incompetent people and very corrupt people. >> reporter: here's the truth-- puerto rico has received $14 billion since hurricane maria nearly two years ago. every time the governor goes on television and speaks it's like pouring fuel on an open flame. >> president trump continues his war of words with four democratic congress wembley he women he told to go back where he cams from.

>> i really think they must hate our country. >> reporter: the president is still on the attack now calling these four congresswomen racist. in a tweet today he said "the squad is a very racist group of trouble-makers who are young, inexperienced and not very smart." >> mr. president, why is the squad racist? he didn't respond but elevated the profiles of these freshmen congresswomen after tweeting last week that they should go back to the countries they came from. >> yeah, i'm not going anywhere until i impeach this president. >> reporter: michigan representative rashida tlaib is part of the squad and spoke at the n.a.a.c.p. convention in detroit today. >> it's beyond just the four of us. you are all the squad. >> reporter: the cbs news poll shows 82% of republicans agree with president trump's go-back tweets while 88% of democrats disagree. ( chanting send her back ) >> reporter: supporters of the president's rally in north carolina last week chanted "send

her back" in reference to minnesota congresswoman ilhan omar, an immigrant from somalia. the president did nothing to stop it, he later said he was unhappy about it but called the crowd incredible patriots. >> you have a chance to say it right now. don't do it again. >> chief washington correspondent pressed major garrett pressed vice president mike pence on whether team trump would stop future racist chants. >> major, the president was clear. >> reporter: was he? >> that he wasn't happy about it and if it happened again he might -- he'd make an effort to speak out about it. >> reporter: today in the oval office, the president was asked if he's concerned about inflaming racial tensions and the president claimed there are no racial tensions. tensions remain high in the persian gulf with iran is holding a british oil tanker and has arrested 17 people spying for the cia.

>> reporter: tehran released this video claiming it was clear evidence of a c.i.a. spy ring involving 17 iranian nationals and their american handlers, but they offered few other details, and some of the accused, it says, will face execution. speaking at the white house, president trump had this to say: >> i read a report today about c.i.a. that's totally a false story. that's another lie. they put out propaganda and lies. >> reporter: the allegations follow iran's revolutionary guard's storming a british flagged oil tanker over the weekend. radio recordings capture the moment the ship was apparently forced into iranian territorial waters by commandos despite warnings from a nearby british warship. >> if you obey you will be safe. alter your course to 360 degrees immediately. over. >> navy patrol boat this is british -- please confirm that

you are not intending to violate international law -- >> president trump said he's still open to talks with the iranian leaders but as things continue to escalate, he says it's getting harder for him to want to make a deal with them. >> eight months after president trump said he'd be pulling all of u.s. troops out of syria more than a thousand remain. david took a trip to the war zone and filed this report. thi outpost in southeastern syria used to belong to i.s.i.s., but now it's in the hands of american special forces riding out to pick us up like a scene from "mad max." cbs news came to this place with general frank mckenzie, commander of the u.s. forces in the middle east. >> we're standing on the damascus-baghdad highway just inside syria, and we're supporting our partners in the fight against i.s.i.s. >> reporter: from this compound still choked with rubble from the battles, special forces

travel to even more remote outposts to train local tribes to hunt down the remainder of i.s.i.s. >> they try to get in the desert and our partners help go out and get them. >> reporter: it's been four months since the last piece of i.s.i.s.-held territory was liberated and there are still nearly 1,000 u.s. troops in syria. the main american base is in northern syria, where a strip long enough to handle jet transports has been carved out of the syrian plain. it's industrial strength logistics like only the american military can do and there's no end in sight. >> there are still ripe targets out there and we're going after them. >> reporter: nothing here is easy. fall rains turned this dust into ankle-deep mud. the b-22 ospreys that flew us out of syria had to refuel in the air in order to make it. i.s.i.s. may be on the run in

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this is the "cbs overnight news." on this day 50 years ago the crew of the apollo 11 was on its way home after historic mission to put a moon man on the moon. the exploration of the cosmos continues tomorrow when spacex launches a cargo ship to the space station and elon musk has big plans he described to time magazine's editor at large. >> it was 50 years ago on july

20th, 1969,. >> i'm at the foot of the ladder. >> when apollo 11 commander neil armstrong took his giant leap. >> that's one small step for man, one giant leap for mankind. >> and became the first person to walk on the moon. >> about a three footer. >> 19 minutes later lunar module pilot buzz aldrin joined him on the lunar surface. >> beautiful. >> isn't that something. >> spanishirking the imaginatio countless little boys including one little boy from south africa. >> space seems to be in your marrow. >> apollo 11 was most inspiring thing in history, certainly inir. i'm not sure apollo 11.

>> elon musk is the founder, ceo, and lead designer of spacex, short for space exploration technologies. his privately held company makes rockets and space craft. >> i kept expecting that we would continue beyond apollo 11, that we would have a base on the moon that we'd be sending people to mars and here we are 2019 without the ability to send people to lower osh zblit which is why spacex is one of the companies to deliver cargo to the international space station while the russians transport crews. that's because nasa's space shuttle program ended in 2011. >> it made be sad about the future, when you get up in the morning, what fires you up, what gets you excited about live. >> here at spacex headquarters in the los angeles sub your honor of hawthorne what excites

this 48-year-old billionaire is the idea that lots of human beings might one day live on other planets. especially mars. >> one of the sweetest spots in all of the world for people who love space is pad 39a. >> the best pad. >> the best pad. >> it's the pad that sent apollo 11 to the moon. >> we have a lift off. >> many of nasa's most memorable missions began here as well. hallowed ground at the kennedy space center in florida. >> you're looking at a live view of the falcon heavy on historic launch pad 39a. >> i can't believe we get to use this pad. it's an insane honor. -- >> to be sure since its founding in 2002 spacex is the first private company to launch, orbit and recover the space craft and

watch its historic recovery of an orbital rocket's first stage landing safely on an ocean platform. >> falcon has cleared the tower. >> there's also been a number of setbacks along the way. musk often uses the expression rapid reusability. why he argues should rockets make only one trip. >> like an aircraft, when it lands you only expect to refuel it, maybe replace water and food. clean it out. >> exactly. >> it's minor. the normal expectation is you can reply the plane very rapidly and turn it around in an hour and fly somewhere else. this is what needs to happen with rockets. >> elon musk is it not the only billionaire thinking big. richard branson's gall actic for commercial space flights for tourists and amazon has blue

origin in hopes of building space colonies. >> i think it's good what he's doing. >> and musk isn't only thinking big, he's thinking fast. >> regular trips to the space station. >> to launch a crew to the space station my guess is about six months. >> how about the moon? >> this is going to sound pretty crazy but certainly with an uncrewed vehicle i believe he could land on the moon in two years. >> but always on his horizon, the planet mars. >> sending crews to mars in four years sounds pretty doable. internally we'd aim for two years and reality might be four. >> one day he even imagines cities on the red planet. >> to have a self-sustaining city, how you going to get a million tonnes to mars.

>> that's serious pay load. >> yeah. >> in the long run no telling what lies ahead for inhabitants of our planet earth but elon musk says he wants to humanity to survive wherever we make our home. >> you want to believe you're out there among stoars. that's (flight attendants) ♪ when you have nausea,

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for more than a week now we've been looking back at the historic apollo 11 mission 50 years ago that landed the first men on the moon. it was directed from the johnson space center in houston and years after that apollo program helped houston grow into space city. michelle miller reports. >> reporter: in a space where size matters, houston is the top dog of texas. the biggest city with the byzanti busiest port in the nation, it's skyscapers reaching for the heavenle based on an identity built on trying to get us there. >> how much did nasa built its framework into the city.

>> it's huge. >> she joined the houston chronicle to cover mission moon. >> you can look everywhere and there's space stuff everywhere. >> there's even a moon walking cow at the intercontinental airport. and not one but two celestially-inspired sports teams, the astros and rockets. >> houston is among first words uttered in outer space. >> author of "american moon shot". >> nasa looks to houston as the vatican of space. >> which had very humble beginnings according to rice university professor melissa keene. >> houston began as a muddy, swamp, yellow fever trap. >> she pulled photos from the archives of houston at the turn of the 20th century. >> this is buffalo bayou the

locust of the growth of the city but it started essentially as a big, wide creek. >> city leaders envisioned expanding that creek into a 25-mile long shipping lane from the gulf coast port of galveston which was levelled. >> and they took advantage to do this audacious construction project. >> without this you won wouldn't have had the infrastructure for nasa to be here. >> that's right. >> in fact. nasa was looking for the right stuff. city with elite universities to support research and training. modern airport. andle climate for working out doors year round. by 1960 houston had it all plus good old boy politicians to boot. >> you had to have political clout and houston had it in

abundance. >> next month we'll have leadership in space you wouldn't have without albert thomas. >> thomas controlled the budget for nasa as chair of the subcommittee. and vice president johnson was also on board and construction magnet george r brown. >> kennedy barely won houston in 1960. he would need to win it in 1964 and pouring hundreds and millions of dollars into houston was good new frontier politics. >> nasa announced the manned space center will be located in houston on september 19, 1961, and every news paper in town the front page was covered we're space city. we are now fighting the russians from houston. it was -- spectacular. >> a year later president kennedy was at rice teeing up the mission. >> we choose to go to the moon -- >> and all of a sudden we felt like a youn vibrant, and

important place. we're building satellites. our experiments are going up in space. >> rice university was all in too. donating land on the outskirts of the city for nasa manned space center and the people who worked there. >> three years later there's a small city there and what you can't see in this picture is all around it residential areas begin springing up like mushrooms. >> which became home to the mercury and apollo astronauts including the soon to be first armstrong, aldrin and collins. >> it was a oil town once nasa comes every business wants to be part of this moon energy. >> nowhere more boldly than baseball's newest treasure the astro dome the world's first multi purpose dome stadium for

the team who swapped out its old colt 45 moniker it is here where they were welcomed back to their official home coming hosted by frank sinatra himself. 50 years after the eagle landed nasa hopes to return. . this time as a jumping off point to go even further into our solar system. >> people around my age they want to go to mars. so many people said i am not having kids because i want to go to mars. >> what sparks that curiosity. >> there's a little bit of i want to be the first. i'm confident. which is what we had in the 60s. >> the 60s douglas brinkley says was a "time" of monumental change, personified in a single american city that dared to dream big. >> this may be the age of neil armstrong we're living in now. that's how large earth's breaking gravitational pull is

so houston now may be seen as the great american ity

. president trump war of words with four democratic congress women have images of racism telling them to go back to where they came from and at a rally chanting send them back. we spoke to supporters who tell it us what that chance means to them. >> i have been told countless times to go back to my country. so many times that i can't even remember. >> everybody has a story. right. this is not something that is in anyway unusual this is like everybody's experience. >> phrases like speak english this is america. to have to be reminded this is america. hello. i know it's america, i was born here. >> sometimes they were just

questions about where are you from and i'd say i'm from dallas and people would say no really where are you from. it's like oklahoma originally. >> i was chasing this very thing that wouldn't accept me, at the same time i was leaving behind parts of my indian heritage. i asked my parents to stop packing indian lunches that my white counter parts told me smell too bad. >> i shouldn't have to justify my existence and that i belong here but sometimes you just have to say it, i'm just as american as anyone else. >> it really comes as a sucker punch and reminds you gosh maybe your place in this country isn't quite as secure as you think it is. that's somewhat frightening. [ send her back ]. >> the crowd was talking about sending her back for criticizing the u.s. and you know, when you think

about bernie sanders he criticizes america every day and nobody tells him to go back where he came from. >> now feel fearful for m peers of color. i feel fearful for children of immigrants. i feel fearful for immigrants. >> i think it really elevates this to a different levelful this country has been amazing to us. and yet, you know, i think a lot of people have had thoughts over the last few years, like what if this doesn't last. what if this isn't somehow permanent. >> can't put all americans into a spread sheet and run an equation and say you're more american than me becauser ancestors have been here longer than mine. >> you're either american or you're not. citizenship is just a yes or no question. >> people love this country and think the idea this country only belongs to some people, you know, i think we need to flee

from that as quickly as we can. >> that's e overnight news for this tuesday. from the broadcast center in new captioning funded by cbs it's tuesday, july 23rd, 2019. this is the "cbs morning news." a political crisis in puerto rico. police in riot gear fire teargas on demonstrators as protests escalate overnight. inked in red. we'll break down the bipartisan budget plan that some lawmakers say is anything but balanced. streets submerged in brooklyn. a powerful storm wipes away the heat wave leaving flash flooding in its wake. millions more along the east coast are still at risk. plus, linking arms in tennessee.