With bob costas about what drives him. Nightly news begins right now. This is nbc nightly news with lester holt. Good evening from olympiapark on this busy sunday night. Were continuing to watch the unfolding flood situation in louisiana. Well be going there for the latest shortly. But theres news here in rio to tell you about as well. A harrowing experience for american gold medal swimmer ryan lochte and three teammates worp robbed at gunpoint in rio by men posing as Police Officers who stopped the taxi they were riding in. Lochte is describing the ordeal to nbc news and our ron mott has more. A night of celebration shared on social media by ryan lochte turned dark and dangerous as he and three teammates were robbed at gunpoint. The group was in a taxi when a vehicle pulled them over, which lochte detailed exclusively for billy bush. We got pulled over in our taxi and these guys came out with a badge, a police badge. No lights, no nothing, just a police badge. They pulled us over, they pulled out their guns and told the other swimmers to get down on the ground. They got down on the ground. Lochte refused to get on the ground first saying they did nothing wrong. The guy pulled out his gun, cocked it, put it to my fore head and said get down. I put my hands up. I was like, whatever. He took our money, he took my wallet. This afternoon gunnar tweeted, we are all safe, but police are investigating and plan to interview the athletes. The encounter threatened a thrilling olympics for the team. Men and women, 33 medals in all. Does it change the rio experience for the team going home . The fact that they are safe is all we could ask for. Now in the meantime rgs the games will continue. Today simone biles picked up her third gold medal. A big matchup on the track. Usain bolt defends Justin Gatlin of the united states. That should be a heart pumping race. I hate to hear what happened to lochte. Glad everyone is okay. A big milestone to report here tonight. Team usa has now surpassed 1,000 gold medals in modern era summer olympics. The achievement reached last night as simone manual completed the medley giving her team the gold medal in that event and their place in u. S. Olympic history. Michael phelps won another gold as well last night marking the end of an era for a a swimmer who says rio is his last olympics. A short time ago i spoke with the man who won five gold medals here, 23 over his long and remarkable career. He closes this chapter of his life with something more valuable than medals. Happiness. Tell me where your head is at right now. Youre at the end of a remarkable career. Its been an amazing career, a ridiculous career. And theres no better way finishing than how i did. In london i almost felt like i was forcing myself to go through workouts and meets. I think this time leading up into rio, i was engaged in the process. I was excited about the process. Thats what i wanted my last olympics to be. I wanted to say i did everything i could. And being able to come into these games and win five gold medals and one silver, no better way going out. Is that your mind talking or your body . Its everything. I woke up this morning happy. I think this is the true way that i dreamt of finishing my career and hanging my suit up. Looking back, what was the most memorable race of your olympics . The 200 fly is probably my greatest race of my career. I wanted that race more than anything. And i dont know if i have really put my body through that kind of pain in a long time. After losing in 2012 to chad by. 09, it stuck with me for four years. I wanted that one back. Your cheering section increased since london with boomer. I got a chance to meet boomer and nicole the other day. How much has being a family man put you in this sense of peace and happy thans were seeing . Its the most incredible thing in the world. I had one close friend say to me youll find a a real definition of what love is. And when boomer was born, it was literally instantly i felt that. Just something come over me and it was the greatest feeling i have ever felt. Has anyone tried to talked you out of retiring . Everybody. I walked in last night and i said, mom, were not going to tokyo. Im not swimming in tokyo. She just started crying and smiling. Then she was like what about 100 fly . I was like, mom, were finished. Im happy with my career. Michael tells me he will remain active in supporting usa swimming and looks forward to cheering in 2020. He might go to tokyo, but certainly he says not competing. Back in the u. S. , an unfolding disaster. Thousands were rescued in louisiana where the governor says the flood emergency is far from over. Gabe goout narz has the latest for us. Tonight, a desperate rescue effort for a growing disaster. More than 7,000 people in louisiana rushed to dry land. It really is scary. We have never seen it before. Reporter three people are dead, the coast guard plucking panicked residents from rooftops. This stunning video from baton rouge station wafb shows a submerged car. Were coming. Were coming. Im going to break this window. Remarkably rescuers find a woman trapped inside. They reach her and her dog just in time. Today the National Guard hoisting more people to safety. State police flying supplies to drivers stranded on the int interstate. The rivers are relentless spewing in the neighborhoods, choking off communities within hours. Watson where two feet of rain fell, those trapped and families taking to social media begging for help. Throughout the state, Good Samaritans racing in. Within an hour they had six feet of water in their houses. Ann had taken in her friends who escaped hard hit denim springs thinking theyd stay dry. They were wrong. I didnt think we were going to get water here. I woke up this morning and started screaming. I was like, oh, my god. Reporter some of the rivers in the state have already crested. Others are expected to do so later this week. Parts of louisiana are now expecting up to 6 more inches of rain and theres now a flood iing threat for southern texas. Lester . Gabe gutierrez in the flood zone tonight, thank you. In milwaukee a state of emergency is in effect after a violent night that followed the Fatal Police Shooting of a man who had a a gun in his hand was and trying to flee from a traffic stop. Keri sanders is there tonight. Reporter wisconsins governor activated the National Guard. Deploy if theres a second night of violence. Were by the intersection southwest corner, shots fired. Reporter last night the sherman park area of town exploded in a fit of anger after a black Police Officer fatally shot a black man. We dont know whats going to happen if we have a flare up tonight. Reporter as milwaukee cleaned up today, officials tall lid the damage. Burned and or looted, a gas station, bank and a local beauty shop. And seven Police Cruisers smashed and riddled with gunfire. A 23yearold was in a foot chase and had a loaded stolen gun in his hand that he began to raise up. The confrontation was all caught on a Police Body Cam that tonight is not being released. The police chief calls it a silent movie because theres no audio. In the neighborhood tonight, theres a demand to release the video. Every moment that its not released, milwaukee is still waiting. Reporter it was coordinated on social media. As a family mourns the loss of a loved one, a community is still on edge. As the violence here unfo unfolded, rioters fired more than 48 gunshots. Tonight the Police Department has a special unit of 150 officers trained and equipped with riot gear in case crowds gather and get unruly again. Lester . Ke ri sanders, thank you. Donald trump claimed today that if the media covered him honestly, as he put it, he would be beat ing Hillary Clinton by 20 . It was just one of the new attacks by trump on what has become a favorite target. They are the worst human beings in the world. Reporter donald trump now lashing out at a rival you wont find on any ballot. Im not running against crooked Hillary Clinton. Im running against the crooked media. Reporter today in tweet after tweet, trump questioning freedom of the press, unleashing on what he considers unfair coverage of his flailing campaign. I am who i am, trump writes. But thats exactly what the stories he doesnt like are saying. Hes not going to change. Hes appeared before 20,000 people. That shows you the campaign is working, contrary to what the media is saying. Reporter new polling shows clinton leading trump in florida, even georgia into play. A defensive trump growing angrier at reporters, now echoed by some supporters. Questioned on trumps temperament, his running mate argues theres time to turn it around. Its still early in this campaign. Im just very confident. Reporter the rnc says its too early to consider shifting resources away from the nominee. A calculous that may change if hes still sliding after september. Donald trump is unable to stay on message and hes unable to allow an attack to go by. It makes it difficult for his campaign or other republicans to drive a message that can beat Hillary Clinton. Reporter tomorrow in ohio, trump will focus on how to fight terrorism, but today its a favorite trump target, the media, under fire again. Halle jackson, nbc news, washington. Still ahead tonight, an american gold medal sprinter tonight, an american gold medal sprinter push ing one day a rider made a decision. The decision to ride on and save money. He decided to save money by switching his motorcycle insurance to geico. Theres no shame in saving money. Ride on, ride proud. Geico motorcycle, great rates for great rides. The wolf was huffing and puffing. Like you do sometimes, grandpa . Well, when you have copd, it can be hard to breathe. It can be hard to get air out, which can make it hard to get air in. So i talked to my doctor. She said. Symbicort could help you breathe better, starting within 5 minutes. Symbicort doesnt replace a rescue inhaler for sudden symptoms. Symbicort helps provide significant improvement of your lung function. Symbicort is for copd, including chronic bronchitis and emphysema. It should not be taken more than twice a day. Symbicort contains formoterol. Medicines like formoterol increase the risk of death from asthma problems. Symbicort may increase your risk of lung infections, osteoporosis, and some eye problems. You should tell your doctor if you have a heart condition or high Blood Pressure before taking it. Symbicort could mean a day with better breathing. Watch out, piggies children giggle symbicort. 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Im this super laid back person in real life and you have to get to that aggressive place and turn into someone else when its time to compete. That time is now. Shes come to rio to challenge herself like never before. The 200 has always been my favorite race. I call it my baby. The 400 is a new challenge to me. Definitely outside of my usual realm. For people who only follow track every four years, 400 is one time around. One time around. It doesnt look that hard. For anyone who has run a 400, slow or fast, its one of the most grueling events out there. Rio will be bitterswe bittersweet, though. At the olympic track and field trials last month, felix saw her hopes of a golden repeat in the 200 come to an end. For felix, it was one too many. She placed fourth, losing by the narrowest of margins. How many times have you run that in your head . So many times. It was so close, but it just was unfortunate about the whole ankle thing. Just not quite enough time. The gun sends them on their way. A fierce competitor, felix has raced in every summer olympics since the 2004 athens games collecting four gold medals and two silvers along the way. Allyson felix gets her gold. Describe the moment when you know youre going to win it. Sometimes you dont know until the very, very end. But when you know at that final moment and dip for the line and you think you have it, its just joy, that all the hard work has paid off. Her older brother has always been by her side. Hes her agent. And her grandmother is the cornerstone of the family. They just celebrated her 97th birthday. Felix was known as chicken legs back in high school, but her family calls her by a sweeter moniker. Shug. Short for sugar . Is she hard on herself when she doesnt succeed, at least her measure of success. Shes very hard on herself. Shes a real competitor. And she hates losing, but i think she loses gracefully. And as felix aims for the sky in rio, close in spirit and family keeps her grounded. She does call if im not there with her and we prayer together and talk about the things that are important in terms of the outcome of the race. It just help mess put everything in perspective. I love to have that prayer with her and just know that, you know, its bigger than track. Its bigger than winning a race. Its good to remember that. A great family, nice spending time with them. Allyson felix competes again tonight. Up next, how life changes after winning up next, how life changes after winning i wodont know where id be without itre so when i heard about conartists committing medicare fraud. It made me so mad i wanted to give them the old onetwo one, never give your medicare number to get a free offer or gift two, always check your medicare statements for errors these crooks think were clueless, they dont have a clue its your medicare, protect it see more ways to fight fraud at medicare. 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The antacid goes to work in seconds. And the acid reducer lasts up to 12 hours in one chewable tablet. Try new duo fusion. From the makers of zantac. Four years ago in london, Gabby Douglas made history become the first africanamerican gymnast to win the allaround. Here shes helped win the team allaround. For douglas, things are different this time around. Heres stephanie gosk. Reporter her soaring flips, twists and tumbles won her gold in 2012. Its a gold what really charmed the world was her smile. Life for Gabby Douglas was never going to be the same. It was funny because i thought i was going to go to london and win a a couple medals and have dinner with my family. Reporter instead a whirlwind of interviews and red carpets. Even a tv movie about her life. Then finally, a break. A twoyear break. I had to tell you it felt amazing. Training for all that time in the olympics was so mentally and physically grueling. When im done, i just felt like this big relief. But sitting out rio wasnt an option for gabby who has had a competitive spirit since walking into the gym at age 6. To get ready for rio, she moved to ohio where she train ed with a new coach leaving her family behind. Do you ever call up mom and say, mom, i need you now. I do. Im like can you guys fly here like tomorrow. I remember going into 2012. We were the ones pouring into her how talented she was. This time around she believes in her abilities. Reporter gabby has grown in other ways too. Shes taller now topping 5 feet and shes 20 making her an oldtimer in a sport dominate d by teenagers. Its funny because people think 20 is so old, but i feel great. Who thinks 20 is old . Im reaching my peak. In the Team Competition in rio, gabby rose to the occasion. Amazing experience to come back. A return to the olympics is rare frr a gymnast. Getting a consecutive team gold is a record. Stephanie gosk, nbc news, rio. 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For me to be compared to bob marley, for me, it says it all. Reporter this island nation of just under 3 million will lose its collective mind if bolt succeeds in his quest for another golden trifecta in rio. First olympics and second olympics was big. So i know this one is going to be even worse. Its going to be crazy because everybody look for me to do great. Reporter but it hasnt always been a smooth journey. Seems like its always something. From a segue mishap at the World Championships last year to a more troubling hamstring injury at the jamaic jamaicaen olympic trials, and that ever present shadow hanging over the track. Usain bolt has been at the top of his sport for nearly a decade and theres never been a credible link between bolt and performanceenhancing drugs. In track and field, skepticism abounds. How does it make you feel that some people, absent of any evidence, might say hes great but ive got my doubts. I cant do anything about it personally. I just have to continue pushing myself, trying to prove that you can do it clean. Reporter and do it with showmanship and flare. Number one, every day, all day. Ive watched over the years that people always remember that last, yeah you did great, but tough make sure you close out perfectly. That was bob costas. Thats going to do it for us tonight. Nbc prime time coverage starts tonight at 7 00, 6 00 central. Im lester holt. For all of michael phelps, a gold medal in the final olympic race of his career for the olympics very best, first reaching the pinnacle is just a launch point. They work to get there over and over again. Their sights set on a new standard for alltime. Hes not only rewritten the record book, but redefined what superior speed looks like. Now tonight,