Car. The officer sent flying. How the hero cop still managed to make the arrest. And freefalling. A top skier making a sports documentary takes a terrible tumble while the cameras are rolling. Cartwheeling more than 1600 feet down a mountain. How an air bag helped him walk away. Did you hear that . None of us were shocked. Were all okay. Everyone is fine. Good morning, america. To get to. The big debate tonight and want to take a look inside the debate hall in milwaukee. Things really heating up among the gop rivals. Donald trump pulling no punches last night taking aim at ben carson and Donald Trumps going to join us in just a bit. Another big crowd last night laying the groundwork. Miami airport, Passengers Evacuated from a plane after a suspicious passenger made it through security and everyone on edge after that apparent bombing in egypt. David kerley starts us off at reagan airport. Reporter good morning, george. It was more than just one aircraft. At least 20 jetliners held because authorities apparently lost track of this suspicious bag and had to find it. On three, on three. Reporter passengers taken by surprise as miami police board their plane. Everybody out, everybody out. From the front. Reporter just before takeoff the American Airlines jet evacuated. The front, lets go, quickly, quickly. Reporter police ordering everyone on the jet bound for barbados to put their hands on their head. One passenger taken into custody, who the fbi says got through security just before 5 00 p. M. With suspicious items in his carryon bag. Do you have anything on you . Reporter the officer noticed the gentleman not making eye contact then started fiddling with the bag and thats when they kind of jumped all over him. Put him in handcuffs and took him down and ordered all of us to get off the plane as fast as we could. Get off the plane, get on the ground. Reporter the tsa telling abc news the passenger is a dentist and it was his dental equipment which triggered the alarm. At least 20 jets held, delayed or diverted while the search for the bag was on. Cant even tell us if youre going to get where youre going to go. Reporter some 500 passengers affected until the bag and the passenger were actually found. The man was released, george. Theres no word whether he actually got to barbados and whether or not he got his bag back or not. The question, how did he get through security in the first place . Reporter yeah, one source is telling us tsa screeners saw something suspicious in the bag. It was to go to secondary checking and apparently the second officer didnt realize that, released the bag, released the passenger. Innocently the man went to his plane. Tsa hasnt given a specific reason why that second person didnt realize this was a suspicious bag that needed to be checked. Again, the man has been released now, okay, david, thanks very much. The race for president now and the candidates facing off in tonights big debate. Donald trump and ben carson will be center stage again. A new poll shows they are neck and neck. Last night trump giving a preview of the attacks carson may face and trump will join us live in a moment but first abcs tom llamas is there in milwaukee for tonights showdown. Good morning, tom. Reporter robin, good morning to you. The debate takes place here at the milwaukee theater and youre right, trump spoke in front of a huge crowd last night putting the pressure on dr. Ben carson but this morning weve looked into the stories that hes been questioned about and some are checking out. Overnight, donald trump unleashing on dr. Ben carson and the new scrutiny over carsons life story. This is the only election in history where you are better off if you stab somebody. Reporter trump and carson now neck and neck in the polls, the retired neurosurgeon forced to answer questions about his violent youth. If you try and hit your mother over the head with a hammer, your poll numbers go up. A lot of weird things are happening. This is a strange election, isnt it . Reporter carson standing by the stories he wrote about in his autobiography and talks about on the campaign trail like turning his life around as a young man after trying to stab a fellow teen. Carsons campaign pointing to an article in parade magazine in 1997 where his mother corroborates the storytelling the reporter, oh, that really happened and after the wall street journal reported discrepancies in carsons account of an incident at yale where he said he was honored as the most honest student after a class hoax involving a bogus test a fellow student who staged the hoax telling abc news, carson was not lying saying, quote, i think he got it close to right. I do not remember this level of scrutiny for one president barack obama when he was ruvening, in fact, i remember just the opposite. Reporter but as other candidates say, this is all fair game, carson finding some support from senator marco rubio. I know everything i need to know about ben carson. He came from a poor family with no advantages in life and worked hard and became one of the worlds most renowned neurosurgeons. Thats all i need to know. Reporter the debate is tonight. Itll be two hours and starts at 9 00 eastern. There will be eight gop candidates on the main stage. Governors christine and huckabee did not make it. So much focus going on with carson, unclear how much policy theyll be able to squeeze in. We will see. Lets talk to donald trump. Mr. Trump, thank you for joining us by phone today. Sounds like youre ready to tee off on ben carson tonight. No, not at all. Well see what happens. Itll be loose and flexible. I have no idea whats going to happen but it will be interesting. As weve seen in toms piece right there, some of parts of carsons story are starting to check out. When i talked to him on sunday he said you jumped the gun on those stories and that calls into question whether youre fit to be commander in chief. If he repeats that tonight how will you respond . Well, ill just simply say and mean it to the bottom, you know, the case was made that he went after his mother with a hammer and he wanted to hit his mother over the head with a hammer, that he stabbed somebody, that he had hit somebody in the face with a lock. He smashed somebodys face with a lock, with a padlock and other things and im saying hes trying to justify this because he wants to be telling the truth and hes trying to justify it and then he said hes pathological. He has a pathological temper or something and he wrote that himself in the book and, you know, im trying to figure out whats going on over here. You hit somebody in the face with a lock and go after your mother with a hammer, you do all of these things and youre trying to justify that, yes, you did them and thats supposed to make you credible. We heard the word its a very strange situation. Heard the word hammer several times in your answer. Want to ask you about an abc news poll. You and ben carson at the top of most polls right now and both doing quite well with republican voters, high favorability but when it goes to the general election voters, hes doing. Better than you. Hes got a 50 favorability. Youre only at 38 and 59 unfavorable for you. How do you explain that and anything you can do about it . Well, sure, you do a lot about it once you tart running and focusing on that. Zogby came out with a poll where im at 30 to 127 against ben and i beat hillary headtohead in numerous polls but thats a Different Group of folks. Right now im dealing with republicans. Youre also dealing with china in an oped in the wall street journal today you say its time to tell the truth on china but critics say the policies youre calling for will spark a trade war that will backfire on the united states. How do you respond. Whats a trade war . Were losing 400 billion a year with china in terms of imbalance. Theyre killing us and in every respect and their currency manipulators are beating us with their currency manipulation and other things so when you say trade war theyve got a trade war against us. They beat us at every front. We have people literally that have no clue and if you look at what china is doing step by step by step, i mean, trade war, sure, you wont even have a trade war. China has taken so much money out of the united states, so many jobs, so much of our base that trade war, i dont think youll have one, frankly, because they cant afford a trade war. We saw last week unemployment down to 5 . Federal reserve almost certain to raise rates. Is that the right move . It is the right move but the unemployment is not 5 . The unemployment is probably close to 20 . If you look at all the people out there that want to get jobs that have given up youre talking about unemployment thats actually close to 20 . The world is not happy. You know, you talked about my big crowd at the arena last night. It was in illinois, it was unbelievable. Believe me, if real unemployment was at 5 i wouldnt have had 10,000 people at that arena last night. Who else is in the hot seat tonight . I think everybody. I mean, look, its a contest. Its a very interesting set of characters. Everybody has a very different point of view and i think its going to be an interesting time tonight. I look forward to it. We do too. Thanks for joining us this morning . Thank you very much, george. Lets talk to matt dowd about this. How do you explain this, donald trump, ben Carson Holding on strong at the top of the polls. Anything can bring them down. I think what explains their strength their authenticity so who they are, they seem genuine and their stories and all that. In the end thats what could bring them down if it bears out their stories and what they stand forrant authentic the cracks would drag them down immediately. The other thing i think theyll have to prove tonight especially is that people can see them as commander in chief. There is a question about whether the voters can see them as commander in chief. Will they get pressed for details on their policy. What are you watching for. Subplots. Will jeb go after marco rubio in the course of this . Will donald trump and ben carson engage in the midst of this and i think ted cruz is in an interesting position because i dont think he has an opportunity to bash the refs so what will he do. Some talk of ted cruz and jeb bush doubleteaming marco rubio. I think it would be a mistake by them to go after marco rubio. Marco rubio is a young guy with a great story. I think theyre better off letting the moderators doing the work instead of them doing it. Lets see what happens. Matthew dowd, thanks for being here. Later ill head to washington for an exclusive interview with president obama. Well bring that to you friday right here on gma. Robin. All right, major health news. An important new study on Blood Pressure that can save lives affecting at least 17 million americans. Abcs dr. Richard besser is here and these are dramatic findings, rich. Really dramatic. The big question for people with high Blood Pressure has always been if you treat it how low do you go . People at high risk for heart geez was 140 or 50 for that top number. What they wanted to see here is what happens if you bring that all the way down to 120. So the researchers did a study, half the people went for the current target of 140, half at 120 and studied 9,000 people. All over 50, no diabetes and they were all at risk for Heart Disease. They had to stop the study early because there was a 25 reduction in bad outcomes like heart attack, stroke or deaths from Heart Disease in lowering it by 20 points, medication is what led to that reduction. Exactly. Side effects, you know, when you talk about medication, is the 20point difference worth the side effects. There was a tradeoff so to get it down that low on average people had to be on three medications to get it to the 140 it was two medications and there was a slight increase in er visits for a number of things for low Blood Pressure, for fainting though there was no difference in falls and kidney injuries so there was a bit of a tradeoff there. What are your recommendations. There are 17 Million People who may benefit from that. A lot of people. Talk to your doctor to see if the benefits outweigh the risks but there are so many things people can do to bring down their Blood Pressure without medication. So maintaining their weight. Regular physical activity. Making sure theyre getting good sleep. Keeping the salt out with those processed foods. Those things could take care of some of this or make it easier to control. All of this is encouraging, thank you very much. Dr. Besser will be taking your questions throughout the morning. You can tweet him drrichardbesser. Snow, hail rain and its moving east and ginger, so many are on the lookout for a blizzard. So many. Youve got to see the numbers. First, san francisco, california, picture of the thunderstorms that rolled through the bae. That is the Golden Gate Bridge getting struck by lightning. You move to nevada where it came as heavy snow and this same storm now digging into the west with Winter Weather advisories from nevada up to montana into colorado and utah. Look at that blizzard warning and watch, northeast colorado, western kansas and nebraska, that means wind, plus snow. It doesnt necessarily mean you get tons and tons of snow but does mean really bad travel conditions and out front, potential for tornadoes, damaging wind and, of course, that large hail. Des moines to peoria back to st. Louis. More on this coming up. For now back to robin. Amy has the mornings other top stories beginning with big news, the university of missouri. Thats right. The School Football team there will resume practice after the schools president resigned amid growing racial tension and the chancellor says he will step aside from his position, as well. Students and faculty had joined the Football Teams protest. The team threatened to boycott over how racial tensions were handled. So coming up at 7 30 we will talk to Jonathan Butler, the grad student who staged a Hunger Strike triggering the protest on campus. A setback for president obamas immigration plan. His executive order would have protected 5 million undocumented immigrant children and parents of u. S. Citizens from deportation. But now an Appeals Court has sided with 26 states who say the president exceeded his authority. The white house is expected to appeal to the supreme court. And there are new details in the growing scandal involving russia and the olympic games. This morning russian president Vladimir Putin says doping accusations against russian athletes and claims that the russian government staged a coverup are, quote, unfounded. Putin says no evidence has been presented by the world antidoping agency. But the russian track and Field Federation has been given until the end of this week to respond to that report. Russian athletes could be suspended from next years summer olympics. Well, some dramatic video from alaska. Pro skier ian macintosh, look at him there, he tumbled 1600 feet downhill while filming a movie. He deployed an air bag safety device on the way down, thankfully and remarkably was n uninjured. Once he stopped, macintosh was heard saying, im okay. By the way, the movie is called paradise waits. Finally if you want to get a good night sleep we have a very unusual suggestion. Turn the lights off when youre brushing your teeth. A neuroscientist in britain studied the issue and said bright bathroom lights could be waking up your body as it should be preparing to rest. You know, i actually brush my teeth in the dark in the morning so im actually still asleep right now. Did you know that. Do you do squats when brushing your teeth . Thats gingers thing. And they really tire you out. Squats, check. Lights off. Thanks, amy. That Dramatic Police chase caught on body cam in just 30 seconds. Back at 7 17 with that wild ending to a police chase in oklahoma. An officer lucky to be alive after his cruiser was rammed headon by an suv. T. J. Holmes here with the story. Hey, t. J. Reporter good morning. He was under the protection of god. That is how a police chief describes how his officer got out of the situation in which he came facetoface with a suspect in an suv. The officer pulls his gun. The suspect hits the gas. Horrifying moments as an suv races towards a police cruiser. A Police Body Camera captures the driver appearing to aim right for the officers karaming it before being stopped by two gunshots. It all began when officers in tulsa, oklahoma, chased a woman for five miles. She was accused of stealing an suv. Eventually they corner her vehicle in a School Parking lot. Police officer matt stacy races out of his car in an attempt to lay down spikes to flatten her tires. Three seconds later it comes barreling toward him. Stacy gets off two shots. Stop, stop. Reporter his body camera shows him tumbling to the ground and racing back up. The suv careening to the other end of the parking lot. The officers run after the suspect who taunts them. Put your hands on top of your head. Do not move. Reporter eventually theyre able to subdue her. Taser, taser. Reporter she faces four felony charges. The tulsa police chief commending his officers for the job they did. And shes taunting and yelling at the officers. Some profanities. They do believe drugs was involved here but the officer checked into the hospital, got checked out and hes out of there. But, again, that was at an elementary school, all right, and shots were fired. No students or teachers involved but an ugly, scary scene. The officers there doing the right thing, all right. Thank you, t. J. Much for ahead. Those dramatic developments at the university of missouri. The president stepping down. The chancellor being reassigned and racial tensions and protests over there. Will other colleges follow suit . Now the student whose Hunger Strike started it all is going to speak out only on gma. A new lawsuit taking on one of your favorite cereals right there. Well be right back. 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