In the gymnastics finals tonight. Nightly news begins right now. Announcer this is nbc nightly news with lester holt reporting tonight from the olympic summer games in rio. Good evening from brazil and from baha olympic park at the start of another evening of competition after a very good day for team usa. Well have more about the action he a start here at home with donald trump and a potential new controversy simmering tonight after a remark that, at best, was a joke and at worst was an implied threat of violence. Well let you here in a moment and let you decide for yourself. Note that it comes as our new poll shows trumps efforts to regain lost ground have exposed a new weakness among what has been his strongest core of support. Nbcs Hallie Jackson has late details. Reporter late today, donald trump under fire for this. If she gets to pick folks. Although the Second Amendment people, maybe there is, i dont know. Reporter the Clinton Campaign believes trumps suggesting violence. Quote, what trump is saying is dangerous. Democratic senator chris murphy calling it an assassination threat. Listen again. If she gets to pick her judges, nothing you can do, folks. Although the Second Amendment people maybe there is, i dont know. Reporter trumps quote, tremendously unified which gives them great political power. Reporter you dont believe he was inferring any violence relaing to Hillary Clinton . Of course not. Saying donald trump is right. If Hillary Clinton gets to pick her Second AmendmentSupreme Court judges, theres nothing we can do. If hes suggesting violence against his americans say we dont condone and should not be president of the united states. Reporter new signs the controverial candidate is in trouble with his base. Sean voted for trump in the primary and wont back him in november. Sometimes some things are better left unsaid. Reporter trump lost support with white men in the last two weeks as they begin to back hillary in stead. Our online poll now showing a double dig member without a College Education his most dependable source of support until right now. Among all white voters with college degrees, clinton getting stronger in blue battle grounds donald trump needs to win. Donald trumps drop in support among College Educated white is is happening at the almost exact same time many moderates and businessmen are abandoning trump for clinton or someone else. Thats not a coincidence. Susan collins from maine who says she cannot vote for trump and trumps comments now riing to the level of the secret service telling nbc news tonight the agency is aware of those remarks. Halle jackson tonight. A hospital has moved its newborn looking into whether the deaths of two infants could be related. Reporter all nine infants at a neonatal care unit have been moved to other hospitals after the discovery of bacteria that can be deadly for fragile newborns. A hospital official says two infants in the unit recently died. Theres been no the infection itself. Reporter three of the nine patients tested positive of the bacteria, but none of them showed symptoms of the bacteria. Its called pseudomonas and it can be deadly for newborns who dont have hearty immune systems. Its a big deal when we find this in a neonatal care unit because these infections can have grave consequences for the children. Reporter the centers for Disease Control says hospitals 6700 drug resist stand cauing 240 deaths, mostly adults. Two newborns died from it ten years ago at A Los Angeles hospital and it killed four infants in 2012 in the uk. Hospital officials insist it was routine testing that discovered the bacteria, which they believe came into the Neonatal Unit through a water pipe. Pete williams, nbc news, maryland. There was no end to the nightmare for thousands of travelers today as from a system outage that grounded planes across the world and today the airline cancelled another 680 flights. Nbcs Kerry Sanders is at deltas largest hub in atlanta. Good evening. Reporter good evening. Tonight, delta cant say how many flights have been delayed but we do know the number of delta flights cancelled in the last two days than 1600. Tonight there are frustrated and exhausted passengers here in atlanta and around the world still trying to get from point a to point b, including a woman wearing her wedding dress. Delta Airlines Says it has narrowed the problem down to a power surge that took out a computer module and the backup system also failed. Lester. Kerry sanders in atlanta, thank you. New questions are being raised about the safety of Amusement Rides in this country after something went terribly hospitalized after plummeting from a ferris wheel, and it comes so soon after a boy was killed in a water park in kansas. We get more from nbcs gabe gutierrez. Reporter the images are horrifying. A ferris wheel basket overturned at tennessees Greene County fair. We have had a Major Incident at the ferris wheel. Theres been at least three fall out. Reporter three children plunging more than 35 feet. There was some rocking, i didnt think it was such a big deal. Most people rock it yw follows the death of a 10yearold boy at a water park in kansas. The National ConsumerProducts Safety Commission estimates 7,000 people went to Emergency Rooms last year for ride related injuries. There are no federal regulations for Amusement Rides and specifics vary widely across the country. 24 states have comprehensive government inspection and accident investigation programs. 11 states, including tennessee, have minimal requirements and leave oversight to the private sector. Nine states have states have no regulations. We need consistent regulations, consistent standards across the board. We need these protocols and we need them now. Reporter the International Association of amusement parks and attractions tells nbc news safety is its top priority, adding theres no evidence federal oversight would improve the already excellent Safety Record of the industry. The ferris wheel at the Greene County fair was last inspected on june 21st. With no violations. Third party inspectors were brought in today to lo it looks, at this point, that it was a mechanical failure that caused this. Reporter tonight the rest of the fair is open, as investigators try to piece together what went wrong. A representative for the company that owns this ferris wheel says its thoughts are with the family of the three girls who were injured. They range in age from 6 to 16 years old and tonight the youngest remains in critical condition, lester. Gabe gutierrez, thank you very much. Lets move to Rio De Janeiro could be a spectacular night as the americans look to make even more history. Were not going to report any results that havent already been widely reported. But ahead of our prime time action, we can tell you, as expected, the american womens Gymnastics Team was golden. This as the biggest names in u. S. Swimming are getting set for giant races tonight. Nbcs Miguel Almaguer has all the action for us. Reporter the american women keep setting the bar. Its critical, this combinatio Reporter Team usa led by simone biles, the smallest athlete with the biggest impact. Today the first ever backtoback team gold. Moments ago, simone biles on the win. I felt like i would cry, but im too happy to cry right now, but it definitely feels like a dream. Reporter with the russians fighting to make the podium, their athletes face and youre hearing boos as team russia comes out. Reporter the bad blood came to a head last night. She is one controversial figure along with an entire country. Reporter russian Yulia Efimova mocked by lilly king before the start of the 100 meter breaststroke. You can really feel king exploded through the water and off the wall. The american beating the russian. Striking gold, making the statement in the water and taking a stand out of the pool. We can still compete clean and do well at the Olympic Games and thats how it should be. Efimova called the drama politics and the open hostility sad. Tonight,michael phelps headlines the duel in the pool, the tension with rival South African written on his face. Le clos still continues to look over at michael phelps. Reporter both men easily qualifying for the 200 meter butterfly, le clos, the defending champ versus phelps, the greatest ever. Tonight gold is on the line and history is at stake. With many complaining about traffic jams and security getting into the venues, ticket sales havent been a problem. And lester, once folks get inside, theyre witnessing the greatest athletes on some of that swimming will take place just behind us here. Thank you very much. Were getting a rare look this evening at striking images inside a city under siege. Fighting has escalated in syrias largest city between the Rebel Coalition there and the Government Forces and now the u. N. Is warning of a humanitarian disaster with some 2 Million People cut off from Running Water. We get the latest from nbcs bill neely. Reporter in a city of ruins, its rebels against the regime, neither able to win, neither willing to give up. And caught in the middle in aleppo, more than a Million People. Like this man. Screaming, where is my son . His child buried, dead. The u. N. Today called for a cease fire, warning of a catastrophe. The last full day of Running Water here was a month ago. But the u. N. s plea may fall on regimes aim to encircle and destroy each other. They each control half of aleppo. The Rebel Coalition led by jihadists with other groups backed by the u. S. And the government backed militias. Rebels broke a regime seize just days ago, but a russian air strikes are relentless. This teacher sends video updates every day. Reporter its slaughter without mercy, this mans wife lies dead before him, then he raises his arms for the body of his baby son. Babies are born into a world of dust. Aleppos only miracle is that anything is left standing. Syrias oldest city, dying like the people in it. Bill neely, nbc news. And theres more to tell you tonight. Some say she may be the best of all time, were at home with a superstar american gymnast, simone biles chasing her first back now from rio, where the final five as theyre being called took center stage today, the usa womens Gymnastics Team led by one woman whats being called the greatest of all time, simone biles. She was too young to compete in london, so many at home may not know her. But thats about to change bigtime. Heres nbcs stephanie gosk. Reporter no one flies higher, performs harder routines or wins more. Simone biles has completely upended the sport of gymnastics. They call that untouchable. Call simone, the Michael Jordan of her sport, making the 49, 19yearold a little uncomfortable. I just dont feel like im up to the expectation yet, so i kind of just blow it off. Reporter what makes her even more remarkable is her story. Simones mother struggled with drug and alcohol addiction and her father was never really there. By age 3, she was in foster care. I got a call from a social worker saying that simone and her sister and ot back in ohio. I said, well, send them to me. Reporter ron biles, simones biological grandfather and his wife nelly brought the kids down to houston, eventually adopting them. Not long off, simone was jumping off the walls, the furniture and just about everything else. She was so tiny and it scared me to death, but it did not scare her at all. Reporter there was no other option, at age 6, she started gymnastics. The kids at school could never do like could always do them on the playground, so i thought that was pretty cool. Reporter younger sister adria is a gymnast too, they are extremely close and typical sisters. Family meals are a chorus of giggles. Like most teenagers simones bedroom is her sanctuary, lots of trophies and lots of purple, along with a lifesized poster of actor and kiss him. You come in and give him a little kiss . Yeah, its a little strange. Reporter that playful spirit is a big part of who simone is. Watch as she outruns a bee at the 2014 world championships. Even facing the pressure of rio, she manages a laugh. The bar is high for rio, thanks to yours. To yourself. Is that inspiring or both, terrifying because i dont want to let anybody down, but exciting just to know that i have done and accomplished so much. Hopefully i can continue to do that. Reporter simone biles has four more chances to win gold, shes heavily favored to win all of them, if she does, lester, she breaks a record. Back to you. Certainly one of the most talked about athletes here at these games. Stephanie, thank you. Were back in a moment with incredible images showing an ominous were killed. There is grim news from chicago tonight, a 10yearold boy playing with his twin sister was among the 19 people shot as that city marked its deadliest day in 13 years on monday. 19 people shot, nine of those were killed. The most homicides in a day there since july 5, 2003 as that city continues to struggle to contain the violence. A rapidly spreading wildfire burning more more than 7,000 acres. The intense flames in the San Bernardino mountains has forced thousands of people to evacuate and shut down a number of area schools. Thousands of homes now threatened there. An incredible sight caught on camera, video showing a massive dust storm moving through phoenix. Strong winds dropping visibility at the airports to just a fraction of a mile. It was triggered by heavy rainfall miles away in tucson, where flooding water forced water rescues. When we come back, the american who overcame all the naysayers to become you one of the Untold Stories here in rio, the usa rugby team which scored a big win today and takes the field again tomorrow. Our ron mott talks with an american who has been called the fastest in the sport. Reporter at 58, carlin isle is used to being too small for this or too small for that. Its a big part of what still motivates him today at age 26. If i quit, then they win. Reporter growing he didnt measure up. Foster homes, schoolyard fights, not enough to eat, couldnt read. A bleak start for certain. I had a picture i wanted to paint for myself and my life and i wasnt going to let anybody dab their paint brush in my painting because then it would become theirs. Reporter one day he found his footing, setting records at his Ohio High School at the track and dazzling crowds on a football team, and now a runaway sensation in a sport few americans know, rugby sevens. How does that happen . I started watching it and i thought, i think i could be pretty good at this. Reporter not just pretty good, fastest in the world good. In rio, he and an upstart American Team hope to go home with a respectful showing, if not a medal and his speed is key. This dude is fast, lightning fast. Reporter given the speed his attention overcome with a reminders in writing, on his chest, a teenaged tattoo that didnt go over so well with his mom sandra isles who adopted him and his sister when they were 7. I was like, what are you doing . And its a big old necklace that says focus, but that was his words of determination. Hes a hard worker and when he wants to do something, he goes for it and he doesnt give up at all. Reporter that drive and rare athletic talent left one gym owner in such awe, he helped carlin chase his olympic dream, buying him a car and i really believe in him and thought he could do it. I think im a good judge of character. Reporter the pitch is his canvass and carlin isles is ready to create a masterpiece. It didnt matter how much money you have, no matter how many parents you have, you dont have to be your circumstances. You can change your gambling at the games in rio is now legal. Find out how senator john mccain is linked to it all. Monsoon 2016 bringing dust and rain and more on the way. New developments on the valley parents accused of leaving their child home alone while they played pokemon go. Ballot blunder round three. Our big story on 12 news at 6 00. Once again on weather watch. Another powerful round of the valley earlier today. Look at this time last dust and rain that moved over downtown phoenix. Check out the damage storms caused in tucson. Flooding turned several streets into rivers. Firefighters had to rescue dozens. Flooding causing problems in Apache Junction where we find William Pitts live. Reporter aj is used to flooding even a permanent sign in this about it but today was more than a lot of people had seen out here. In intersections all over the place underwater. Some closed for almost an hour before the water could drain off. All the rain fell in about 20 minutes. Drainage systems overwhelmed for about an hour. Cars barely made it through. Some roads closed completely. City officials offering up sandbags to people if they need them. It was like sheets of rain