Nbcs katy tur starts our coverage tonight. Reporter tensions high in radford, virginia. Secret service bodyslamming a time photographer who tried to leave the campaignmandated press pen. Trump on edge too, this morning blaming his refusal to condemn the kkk and david duke in a cnn interview on a bad ear piece. Im sitting in a house in florida with a very bad ear piece that they gave me, and you could hardly hear what he was saying. Reporter a complaint he did not make during this interview. I dont know anything about david duke, okay . I dont know anything about what youre even talking about with White Supremacy or white supremacists. I dont know. Reporter trump disavowed the klan he ainfamous former leader last week. David duke and robocalls are out again. The White Supremacist Movement supporting you. Do you have any words for that. I disavow. But i didnt know that. Reporter trump even cited the one time grand wizard is the reen he wouldnt run on the Reform Party Ticket in 2000. A bigot, a racist, a problem. This is not exactly the people you want in your party. Reporter since he kicked off his campaign, trump has been repeatedly accused of stoking racial fears, first with mexicans, then africanamericans and muslims. Donald trump is doing his best to appeal to the constituency of david duke and people like david duke while pretending that hes not doing that very thing. He should be more of a statesman. It wouldnt cost him anything with his supporters and it has the chance of actually bringing more republicans into his reporter this weekend, trump championed the endorsement of alabama senator jeff sessions, the first u. S. Senator to join trump. This as marco rubio got in the mud. How can a person with the worst spray tan in america . You know what they small hands . What . You cant trust them. Reporter hours from super tuesday and time is running out for trumps competitors to make their case. I will go to all 50 states and every territory. I will continue to voice left. I will go anywhere to speak to anyone before i let a con artist get a hold of the Republican Party. Donald trump represents everything youre mad about washington, the dealmaking that doesnt stand with the working men ask women. Reporter despite it all, trump is poised to win big. As you can hear, donald trump is on stage here in georgia behind me. This is another controversy is brewing. Both rubio and cruz calling on trump to press the New York Times to release a of an off the record meeting after buzzfeed reported in it trump may have had flexibility. As the trump train rolls into super tuesday full of steam, some Republican Leaders are now openly expressing deep concerns about the prospect of donald trump as the partys nominee. One gop senator even saying he wont support him. And as nbcs Andrea Mitchell reports, the anxiety has reached a fever pitch. Going on. This isnt normal. Reporter donald trump packing in thousands on the trail again today. But behind the scenes, nbc news has learned trump has many Top Republican officials scrambling, looking for a way to brocklock him from getting the nomination. New poll out today that shows that hes behind Hillary Clinton. In almost every other poll, virtually any other republican theres concern there. Adding to the alarm, trumps response on the ku klux klan, prompting this tweet from 2012 nominee mitt romney. A disqualifying and disgusting response by donald trump to the kkk. His coddling of repugnant bigotry is not in the character of america. Rewith choosing a present like we do American American idol . Theres a lot of people, i think, legitimately worried. Reporter one big concern for republicans, with the ticket if he loses take down with him 24 Gop Senate Candidates . And tonight the first republican senator to say he wont vote for trump if hes the nominee. Nebraskas ben sasse. In a facebook post, he wrote, conservatives will need to find a third option other than trump. This is a guy who says things again and again that sound a lot more like Vladimir Putin than abe ra ram lincoln. There are two key worries among Many Republican officials if trump gets the nomination. First if he wins in november, would he govern as a conservative . And, second, would he even get that far . If democrats are able to successfully attack his past statements and his business records. Lester. Andrea mitchell, thanks. Lets bring in our political director, the moderator of meet todd. Chuck, if trump does well tomorrow, what which other republicans can stop him . Well, the only way they can stop him within the party is to deny him the delegates he needs to get the nomination. To do that, if he does well tomorrow night, imperative that they defeat trump on march 15th in ohio. That could mean every other candidate other than john kasich decides to campaign. Maybe rubio says im going to let kasich go there. Then rubio has to win florida. Maybe they go and find somebody else to rally around to beat him in north carolina. Thats the only way they can do it within the party. If they dont succeed by march 15th, they wont be able to deny this nomination to him. Then its the third party route. There is a Constitution Party out there that has ballot access. If they want to start a third party, youd have to do it within the next couple of weeks to actually get ballot access, but this stuff is real, and it gets very real on march 16th if donald trump continues to roll. Havent seen anything like it, have we . Not since 1860 and the whigs. Remember the Republican Party was born out of another conservative party, the whigs, breaking apart. Chuck todd, thank you. Side, fresh off her landslide victory over Bernie Sanders in South Carolina, Hillary Clinton is looking ahead to super tuesday as an opportunity to pull away in this race. Nbcs Kristen Welker is with the Clinton Campaign in virginia. Kristen, what can you tell us . Reporter lester, good evening. Clinton Campaign Officials say they feel confident heading into super tuesday after that big win in South Carolina fueled largely by africanamerican support. Clinton hoping to build on that tomorrow. Senator sanders vowing not to give up, but he does have a steep climb, particularly if you look at the numbers. Lester, the official nbc news delegate count shows clinton with 519 delegates and sanders with 86. If you only take into account super delegates, those are typically Party Leaders who get to choose who theyll support, clinton gets 428 to sanders 21. Thats a 20fold advantage. Clinton is up with ads in all 11 super tuesday states. Sanders has ads in only five of them, including colorado, massachusetts, and states. Still, sanders has a lot of cash on hand, which means no matter what happens tomorrow, that could allow him to stay in this race indefinitely. Lester. Kristen welker, thank you. Nbc news will have extensive coverage of super tuesday tomorrow night. For many of you, your stations will be carrying the live hourlong editions of nightly news with all the results as they come in. And special primetime can coverage across the country starting at 10 00 p. M. Eastern time. There were terrifying moments today inside an ohio school when police say a teenaged student opened fire, hitting two students and injuring two others. Tonight the suspect is in custody. The students and their parents cope with the aftermath. Nbcs blake mccoy now with details. Reporter it was in the cafeteria of Madison Junior Senior High School where Authorities Say a student opened fire on his classmates. One student managing to call 911 from his cell phone. Theres a shooting. Started shooting people. How many people did he shoot . Im not sure. He just pulled out his gun and started shooting. Reporter two students shot at lunch time. Two others injured in the chaos. The school put on lockdown as frantic parents raced from work. We had to get here. We had to get to him. Trying to be quiet and just keep everybody else around me safe. Reporter the school is in middletown, ohio, the two students shot, 14 and 15yearold boys were flown by helicopter to the hospital. Basically stable at this time. Reporter attention now turns to the accused shooter, a 14yearold male who police say tossed the handgun as he ran from the building. Hes been charged with two counts of attempted murder. A motive is unknown at this time. Its going to be hard for everybody to get over this. Reporter class has been canceled across the district tomorrow as parents hold their kids tight. Blake mccoy, nbc news. Late word that andrews is on the stand tonight in her 75 million civil trial. Earlier in the day, the man convicted of stalking andrews testified. He told the court how he altered the peep hole on Andrews Hotel door and secretly filmed her. Now as nbcs. Reporter erin andrews still haunted by the video that she says has damaged her career. I felt so embarrassed and so ashamed. Reporter her chance to look jurors, seven women and five men, in the eye and tell her side of the story. My naked body was on the front page of the new york post. They had put bars over my body parts. My girlfriend was calling me telling me she was running around new york city throwing coffee on all the papers because she felt so bad. Reporter just hours earlier andrews left the courtroom as her stalker explained the details of the day he recorded her. Deposition videos, Michael Barrett explained how he followed andrews to her hotel room and altered the peep hole. I pulled the plug and waited for the opportunity. What was your intent to hopefully get her without clothes on . Yes. Reporter her mother also testified today describing the embarrassment her daughter continues to face. Its a nightmare that doesnt stop. We kept telling her its not your fault. Youre a victim. Youve been assaulted. Reporter andrews devastated. It upsets. Its so embarrassing. It was my private time. I never thought this would happen. I never thought somebody would i never thought a hotel would let somebody next to me without telling me. Reporter andrews says her entire life has changed, and that this ordeal is always in the back of her mind. As for barrett, after serving almost two years in prison, he now lives in oregon. His Internet Activity monitored by a parole officer. Lester. Morgan radford, thank you. Today, a member of the elite s. E. A. L. Team 6 received the medal of honor. Because s. E. A. L. Missions are covert and usually highly classified, we rarely hear their names or see their faces. But today, one step forward. Nbcs Jim Miklaszewski has the incredible story of his bravery. Reporter as a navy s. E. A. L. , senior chief ed byers rarely emerges from the shadows. Hes one of the silent warriors from s. E. A. L. Team 6, the special Operations Force that previously took down osama bin laden. But today in a rare appearance, byers was front and center at the white house, an american hero. In december 2012, the s. E. A. L. S were on a mission to rescue american doctor dilip joseph, taken hostage by the taliban. As the s. E. A. L. Team approached the taliban hideout, begungun fire exploded. It was pitch black. Reporter petty officer Nicolas Checque was first through the door, was immediately shot, and fatally wounded. Know, a warriors death. He died a true american hereio. Reporter byers was seconds behind and took out the shooter. He had a weapon about, you know, level ready to shoot, and fortunately i was just quicker on the draw on that. Reporter byers spotted the hostage on the floor and threw himself on top of the american. You were willing to take a bullet for that hostage . Thats our job, yes. Reporter byers then grabbed another taliban fighter by the throat. Just gave it enough time for my teammates to come in and get in position to take care of that threat. In times of war or uncertainty, theres a special breed of warrior ready to answer our nations call. Reporter president obama presented byers with the medal of honor which he accepted not for himself but the entire s. E. A. L. Community. For the brotherhood. Its for everything that we have sacrificed since 9 11 in defense of our country. Reporter jim news, the pentagon. There is a lot more to tell you about as we continue on this monday night. Still ahead, losing sleep and gaining weight. New warning about what could be fueling those junk food cravings. Also rocking the stage. Those expecting the oscar host to take on the diversity controversy were not disappointed. At body aches . What knee pain . What sore elbow . Advil liquigels make pain a distant memory nothing works faster stronger what advil. Theres only one egg that just tastes better. With 10 times more vitamin e. 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I dont get as much sleep as i would like. As soon as i wake up, i feel like im starving, and all i want is food. Reporter now research from the university of chicago shows it may be part of a vicious cycle. The less sleep we get, the more our bodies produce a chemical in the blood that increases our cravings. The same system triggered by marijuana. Cravings for the sweets, salty, and fatty foods we snack on in the afternoons and evenings. Were actually eating more calories than needed for energy costs of being awake longer. Reporter previous studies have found adults got an extra hour and a half of sleep a night, the recommended eight hours, their cravings for junk food dropped. People who get less than six hours are at an increased risk of obesity. This doctor runs the sleep center at Medstar Georgetown University hospital. Given 300 calories a day, which could be like one or two cookies in about two weeks can result in gaining one pound of extra fat. The best advice to getting a good nights sleep, doctors say go to bed and wake up at the same time every day and avoid eating anything in the two to three hours before going to sleep. If junk sleep leads to junk food, which leads to obesity and more junk sleep, breaking the cycle could be key. Tom costello, nbc news, washington. Were back in a moment with a gaspinducing moment at the Supreme Court that hasnt happened there in over a decade. Previously treated with its not every day something this big comes along. A chance to live longer with. Opdivo, nivolumab. Opdivo is the first and only immunotherapy fda approved based on a Clinical Trial demonstrating longer life. For these patients. In fact, opdivo significantly increased the chance of living longer versus chemotherapy. Opdivo is different. It works with your immune system. Opdivo can cause your immune system to attack normal organs and tissues in your body and affect how they work. 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