Court. The biggest new battle in years that could have sweeping implications for women across the country. And automatic money back when you shop online. The new way so many consumers are saving cash. Nightly news begins right now. Announcer from nbc news World Headquarters in new york, this the nbc nightly news with lester holt. Good evening. He proved last night that he is the undisputed republican from un, yet the target on Donald Trumps back tonight comes not just from fellow candidates or even from the left, but from the heart of the Republican Party establishment. In fact, the man who last won the republican rom nation, mitt romney, about to join the fight to stop him. It comes as trump vanquishes another opulent, a winless dr. Ben carson effectively throwing in the towel tonight. Trump won seven out of 11 states on super tuesday. On the Democratic StateHillary Clinton with seven victories of her own. Of delegates needed to seal the deal, and that tonight is keeping hope alive for those determined to stop them. Nbcs Hallie Jackson starts us off with the latest. Reporter looking to november, donald trump is looking president ial down to the gold chairs and chandeliers at his press conference just like the ones in the white house east room and trump more measured is sounding president ial too. We have a very, very dynamic party, and i think were going to be able to unify the party. I hope to be able to get along with everybody. Reporter still, four years after he endorsed mitt romney. Governor romney, go out and get him. You can do it. Thank you. Reporter the form om from returning the favor. At a speech tomorrow romney is expected to hit trump hard, even though hes the one driving record republican turnout in almost every state. The mirror image to what democrats saw in 2008. Now for the gop, the will of the people pitted against the will of the party. Governors, congressmen. I reject trump and im encouraging other republicans to do the same today. Reporter rnc members and more. If you dont know where you stand on the ku klux klan every time youre asked, ive got a real problem supporting you. I would never vote for donald trump. Reporter nbc news learning from antitrump donors they are scrambling to pool their cash. Today following up with questions like how can i wire the money so it arrives as fast as possible . Thank you, texas reporter and in the battle to the the antitrump pick ted cruz in second place is getting a second look from the insiders he rails against. Fresh off wins in three states. He may in a position where well have to rally around ted cruz is the only way to stop donald trump. Reporter a Cruz Campaign aide says the gop will pick preserving the party someone notoriously disliked in the field. Trump with a path to the nomination would be could the traffic. Reporter ben carson hinting hell suspend his campaign. Most of his support is likely to slide to cruz, and marco rubio, after winning just one state, now spinning hes happy to be the underdog. We wanted to do well enough to get to the stage were at now. We feel great about florida and moving forward after that. Reporter rubio and cruz are both looking at the math because while donald trump has more delegates its not a runaway lead, not yes. His rivals can make up some serious ground with the march 15 primaries, but on the flip side, thats when trump could put this race away, lester, just two weeks left for his competitors to try and stop him. All right. Hallie jackson, thank you. Meantime, theres word the Trump Campaign is already busy making overtures reaching out to gop establishment leaders. Nbcs katy tur is following the Trump Campaign in palm beach. Reporter hey there, lester. Donald trump has been in an allout war with the republican establishment last night even threatening Speaker Paul Ryan to get along with him or ryan would, quote, pay a big price. Now getting closer to clinching the that donald trump could be trying to make nice, sources within the ryan Political Team telling called the speaker, but the two have not yet spoken. So far trump hasnt been hurt in the battle with washington, the candidate and campaign arming himself with selffunds and growing the party and trump seen uniting the voters against politicians. Now, he hasnt yet clinched the nomination, but hes already acting like he has, vowing to relentlessly go after Hillary Clinton for benghazi, her emails, even saying that he will go after her with her husband and his history with women if he is pushed. Lester. Katy, lets talk about Hillary Clinton on the democratic side. Command after sweeping the south on super tuesday winning seven states to Bernie Sanders four victories and looking up a lot more delegates as she tries to put the nomination out of reach for sanders. But as nbcs Andrea Mitchell reports, sanders is making it clear hes not going anywhere any time soon. Reporter Hillary Clinton celebrating her super tuesday victories over Bernie Sanders. I thank you from the bottom of my heart. Reporter and before all the polls were even closed pivoting towards a strategy against donald trump. Trying to divide america between us and them is wrong, and were in the going to let it work. Reporter her strategy to be the voice of inclusion, a deliberate contrast to trumps tough rhetoric, although clinton aide is saying her message hasnt changed, but laying out choice they want to present to voters. Take the measure of both of these people and who have been fighting to help children and families their whole lives and who has really been in which is where donald trnatoump has been. Reporter clinton won seven states tuesday, sweeping the south and holding a strong advantage over sanders with africanamericans, hispanics, women and older voters. But she is still struggling with some key voting groups. Sanders won twothirds of people under 30, and a majority of white men. Clinton now trying to win them over without alienating sanders supporters whom she will need in the fall. Together we can break down the barriers that face working class families across america, especially in struggling rustbelt communities. Reporter meanwhile, sanders after winning four states last night vowing to stay in all the way to the convention, but the delegate map is against him. Clinton now has 1,017. He only 424. A hard lead to overcome. Still in maine today sanders is not letting up. Again demanding clinton release transcripts of her paid wall street speeches. Tell us what you doors to goldman sachs. Reporter tonight after this labor rally clinton will join some of her biggest high rollers at a concert fundraiser featuring katy perry and elton john. She has ground to make up. New numbers released today show sanders outraised her last month by 10 million. Lester . All right, andrea, thank you. There are new developments tonight in one of the worlds biggest mysteries, the disappearance of Malaysia Airlines flight 370, almost exactly two years ago it vanished with 239 people on board. Now, an american adventurer claims he found what looks like a piece of the airplane wreckage off the coast of east africa, and investigators say there is a high likelihood it could be from the missing boeing 777. Nbcs tom costello broke this news exclusively and has new details. Reporter from the coast of east africa a potential clue into the disappearance of Malaysia Airlines flight 370. Of airplane debris that i found on february 27. Reporter american Blaine Allen Gibson said he found the debris on a sand bank in the mozambique channel, made of a fiberglass composite, the lettering immediately raised suspicions. It has no steps on it as is written on many aircraft wings. Reporter gibson sent his photograph to the Search Command Center in australia which sent it to investigators in malaysia, the u. S. And boeing. Sources close to the investigation tell nbc news theres a high probability the debris is part of the skin of a horizontal stabilizer on the tail of a boeing 777 and very possibly from mma370. Last july the first confirmed of mha370 regard ashore on reuconn island east of madagascar and oceanographers say its possible the same ocean currents could carry debris past way to the coast of africa. Blaine gibson describes himself as a wealthy adventure traveler living in asia who is intensely interested in finding mh370. Even blogging about it and meeting with families, but in an interview from mozambique he insists he wasnt out looking for the plane on saturday. The last thing i really expected is that i would actually find a piece of it. Reporter tonight the malaysian transport minister tweeted high possibility betree found off mozambique belongs to the boeing 777 but also cautioned against undue speculation. Blaine gibson tells me he turned that debris over to australian and mozambique government officials. The mh370 command center says its arranging for a more thundershowero investigation and while boeing is declining to comment veteran crash investigators also say it does look like it might come from a boeing 777 and, lester, there owes only one of those missing anywhere in the world. All right, tom, thank you. Reporter back to you. High drama at the Supreme Court as the justices took up the biggest Abortion Case in 25 years. Tough new texas law, one that many other states are looking to copy, and as our justice correspondent Pete Williams reports, the outcome could have sweeping implications for women across the country. Reporter when Candace Russell of texas realized she was pregnant it was so hard to get an appointment at an Abortion Clinic she went to california. It was about being too few people in the clinic for this area. Reporter a new texas law has forced a number of Abortion Clinics to fall from 42 to 19 and it could drop to 10. The law says Abortion Clinics must meet the same building standards as Outpatient Surgical Centers and clinic doctors must have hospitaladmitting privileges. These minimal common sense regulations that were putting in place is exactly whats needed to improve Womens Health care. Reporter but clinic doctors say complications are so rare the real purpose is to make it harder to get an abortion. I think politicians these laws in order to close clinics and decrease womens access to abortion care. Reporter 12 other states have passed similar laws, some now on hold. Their future depends on how the Supreme Court rules. Reporter one reason the case is attracting such intense interest including from actress Amy Brenneman who had an abortion at 21. It was legal and safe and the right decision for me d i have no regrets. Reporter with Justice Scalia left the court is split with the liberals. Justice ginsberg asked whats the tougher building standards for medical abortions that require taking two bills and Justice Kennedy likely the deciding vote says the texas law seemed to be increasing the number of surgical abortions which may not be medically wise. With Justice Scalia gone the most texas could hope for would would let the law remain in effect and today its unlikely, some justices sending case back to gather more facts on how the law actually works. Lester . Pete williams, thank you. Now to a new twist in the 75 million lawsuit brought by sportscaster erin andrews after she was secretly taped in her hotel room by a stalker. There are new allegations that an executive of the company that owned that hotel who just testified in the case was seen in public last night watching that stalkers video with friends while they commented on it. Nbcs Morgan Radford response. Reporter erin andrews arriving in the courthouse with her parents for day six of testimony, but there would be a delay and a bombshell. Comment . Incorrect. Reporter an executive with west End Hotel Partners which owned the hotel where erin andrews was secretly filmed by stalker michael barrett. On monday. So the owner west End Hotel Partners llc correct. Reporter last night he and two friends were at a nashville restaurant where andrews naked viral video was played openly from a cell phone. A waitress at the restaurant told nbc that peskin and his friends were make fun of andrews body also tweeting he said if it was going to cost him millions he was going to watch it and show everyone. Can you tell us what happened . Reporter in a statement peskin says his friends started viewing the video. I asked them to stop and while they did so, it was not as quickly as i had hold. I would never disrespect miss andrews. I sincerely apologize for my participation in what happened. Exposure like this is what andrews has emotionally emphasized all week. This will always be on the internet. This will always be there. There will always be a reminder every single day. Reporter her Worst Nightmare roaring back to life. Morgan radford, nbc news, nashville. Still ahead tonight, getting money back automatically even after youve made your purchase. 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How can i describe our leaders better than the word stupid. Reporter washington pundits were appalled. Were building a wall. Reporter and they were wrong. He won in seven states just last night, brought a Record Number to the polls and his momentum picked up pace. Trump continues his barroom style, taking on the speaker of the house from his own him. Paul rink, i dont know him well, but im sure ill get along great with him and if i dont, hell have to pay a big price, okay. Reporter through all of it Trump Supporters have stood by him showing up in ever larger numbers. Whatever else the establishment thinks, he has become the voice of a large part of the republican electorate. We need change, and i think right now we need someone thats not what weve been getting. He has his own money, and i think he will represent the people in this reporter so if the gop establishment tries to silence their voices, would that be an attack on the basic principles of why we have elections . If trump voters are denied their choice, what then . Where do they go . Weve been here before. Remember this and we dont know what romney said tomorrow but in establishment tried to keep Barry Goldwater from the republican president ial he lost massively to lbj in the 64 election. Four years later Richard Nixon made his famous comeback so you never know with politics. Tom brokaw, thanks for having you here. That will do it for us on this wednesday night. Im lester holt. For all of us at nbc news, thank you for watching and good night. Hey, have you heard . Heard what . Before School Starts in september, all kids going into 7th and 12th grade have to get the meningococcal vaccine. It protects against diseases deadly. Yeah, thats why they cant start School Without it. Something to share . giggling actually, yes talk to your health care provider. Even kids whove had one shot may still need a booster. The face that launched a thousand tweets. Chris christies blank stare hijacks super tuesday. Now on extra what are you doing back here . Trump wins the primary, but Chris Christie wins on twitter. The face that stole the show. The headlines are hilarious. Chris christie, blink twice if