Nominee . Mitt romney will go after donald trump directly and hard. The gop erupts over trump. I understand why they are doing it. They want to destroy this guy. The establishment is acting insane because they cant control trump. Thats exactly my point, bill. Hes the guy that is shaking it up. Sanders vowing to fight on even as his rival is setting her sights on donald trump. All of the major polls have me beating donald trump. Debris washed up in mozambique linked from the malaysia airlines. Aubrey mcclendon was killed in a fiery crash after big rig charges. A day of a federal indictment on big rigging charges. Thieves storming a star getting away with 50 weapons scott kelly is back home in texas after nearly a year on the space station. Leaving the space station was bittersweet. A gunman tries to rob a georgia convenience store. All that. In times square, a police horse goes wild, bucking the officer and then taking off. It was weird. I was like where is the officer . I have people work for me. They do all of that stuff. Thats when you know youre a big shot when you dont have to go to the mailbox. Jimmy, im a movie star. And thaul all that matters dr. Ben carson issuing a statement saying he doesnt see a path forward. The good news, he says im ready to operate on your baby brain again. Cbs this morning. Super primary races yesterday the seven states that donald trump won were shock, denial, anger, guilt, bargaining, depression, and alabama. This morgs of cbs this morning is brought to you by toyota. Lets go places. Welcome to cbs this morning. Gayle king is off, Soledad Obrien is with us. As you wake up in the west, former republican president ial nominee mitt romney is about to launch a vicious attack on donald trump. Cbs this morning has obtained excerpt from a speech romney will deliver in a few hours. Romney plans to say, quote, a person so untrustworthy and dishonest as Hillary Clinton must not become president. But a trump nomination enables her victory. The speech also calls trump, quote, a phony, a fraud whose promises are as worthless as a degree from Trump University. And romney says he is playing the American Public for suckers. He gets a free ride to the white house and all we get is a lousy hat. Dean reynolds is at the university of utah in Salt Lake City where romney is scheduled to speak. Reporter good morning. Mitt romney isnt endorsing anyone and he is not announcing another run for the white house, but he is harshly attacking donald trump who, in turn, is calling it a desperate act. In his speech today, former president ial candidate mitt romney will call donald trump a phony and a fraud. Mitt is tough. Hes smart. Hes sharp. Reporter its a big difference from four years ago when romney was delighted to win the backing of trump. There are some things that you just cant imagine happening in your life. This is one of them. Reporter but now a great gulf separates the two men who represent the defeated past and the uncertain future of the gop. This has been an amazing evening. Reporter romneys Associates Say he has watched trumps assent with alarm and feels the need to shake sense into some voters who are considering the real estate mogul. He will have strong words for donald trump. Reporter Katie Packard runs trump pac after serving as romneys Campaign Manager. I think what he wants to do is be the adult in the room and sort of say, enough. Reporter todays speech comes amid open panic in the Party Establishment and wont mince words. One example, donald trump says he admires Vladimir Putin while he has called george w. Bush a liar. That is a twisted example of evil trumping good. So far, none of romneys attacks has worked, including a call to release trumps tax returns. Going to be a much bigger party and i think we are going to win in november. Reporter trump has soared in the polls and definitely soured on romney. This guy, what a terrible i endorsed him and about two weeks later, i said he is never going to win. Reporter now for good measure, donald trump tweeted this morning, i am the only one who can beat Hillary Clinton. I am not a mitt romney who doesnt know how to win. Dean, thank you. The gop frontrunner will face three rivals in a prime time debate tonight. Ben carsons campaign is over. He said on wednesday i do not see a political path forward. The retired neurosurgeon finished no better than fourth in all of the super tuesday primaries and caucuses. Major garrett is outside the fox theater in detroit, the site of tonights debate. Major, good morning. Reporter good morning. Donald trumps republican opponents are ramping up efforts to slow and possibly stop his pursuit of the nomination. Marco rubio and ted cruz are expected to pound trump a second time at tonights prime time debate. Donald trump has never shown a commitment to the constitution. I have. Reporter in michigan, marco rubio touched on unprecedented angst over the donald trump juggernaut. Usually when youre the frontrunner people say get out of the race so we can unify around the front runner. What people are saying now is, please, everyone get together to keep the frontrunner from winning and destroying the Republican Party. We are going to make America Great again, folks. Reporter after watching trump win seven states they put the metal to the antitrump pedal. Who has trump ever taken on . At Trump University reporter as another multiMillion Dollar antitrump super pac that hammered him at fraud at his defunct Trump University. On capitol hill, the trump factor left republican senators at odds. I dont know what it is about it, but i cant seem to find anyone who supported him and yet here he is. People are not happy with status quo. This man is strong. He is decisive. Reporter perhaps signaling a shift toward the presumptive nominee. Trump began to burnish his image on policy with new details on health care reform. Far more specific than his onenote performance at the last gop debate. You have to have personality. Trump took to facebook with videos extolling the benefits of bipartisan. When youre dealing with congress we have to get them in a room and we have to say fellas, lets go. Its for the good of the people. Reporter 15 states have voted so far and amid record gop turnout, trump won a third of all votes cast and more than his rivals. If we are going to beat donald trump the field cant remain fractured. Donald has, i believe, a hard ceiling of 35 to 40 that he cant get above. Reporter members of the Republican NationalSecurity Community many with ties to the george w. Bush administration released a letter yesterday criticizing trumps lack of Foreign Policy experience. Declaring he would make america less safe and if he becomes the nominee, they will not support him. Ahead, we will talk with one of the former officials who signed that letter. Hillary clinton held a starstudded fundraiser last night in new york city. Clinton is now turning her attention to november as Bernie Sanders tries to catch up. Nancy cordes is with us in studio 57 covering the democratic race. Reporter Hillary Clinton is leading in four big states that are voting later this month louisiana, michigan, ohio, and florida. And as the Clinton Campaign helpfully pointed out yesterday, she is leading sanders by a larger margin in the delegate count than president obama ever had over her in 2008. Its a little bit funny reporter at radio music city hall last night, Hillary Clinton mixed business with pleasure. We have a soldout crowd. Reporter raising tens of thousands from supporters. Youre going to hear me roar reporter and paid to hear katy perry and elton john. This is a very important year for america and she is the only hope you have. Reporter there are still 35 primaries and caucuses to go. But as clinton pulls ahead in the delegate count, she and her backers are focused increasingly on the general election. Labor will always have a seat at the table when im in the white house. Reporter at a union rally in manhattan, andrew cuomo mocked trumps plan for the mexican border. In michigan, the gop frontrunner was on Bernie Sanders mind too. All of the major polls that have come out have me beating donald trump. Reporter sanders won four states on super tuesday and his aides say he has a shot at winning four more over the next few weeks. Clinton aides argue that is not enough. In a memo, her Campaign Manager said that in order to catch up, senator sanders doesnt just have to start winning a few states, but he needs to start winning everywhere and by large margins. Sanders was singing a different tune. Colorado, we took on the establishment there. We won by 19 points. Reporter the Washington Post reported that the Justice Department has granted immunity to the former state Department Staffer who worked on clintons private email server when she was secretary of state. A sign that this investigation may be moving forward. Nancy, thank you so much. A piece of debris that could belong to the missing malaysian jetliner is on its way to experts in australia. The chunk could help explain what happened to flight 370 when it vanished two years ago with 239 people on board. The debris was found off africa more than a thousand miles from the only confirmed piece of the boeing 777. Kris van cleave is in washington with the possible clue. Good morning. Reporter good morning. Mh370 is the only missing 777. The piece found over the weekend likely came from this section of the aircraft and is now on its way to investigators. Sources say investigators are fairly confident the roughly threefoot long piece of metal shown in these pictures came from the missing mh370. The airplane part with the words no step came off the coast of mozambique over the weekend. Blaine alan gibson, one of the men who found it, spoke to cnn. I just knew when i saw it that it possibly could be and that it was important to get it into the hands of the local authorities. Reporter u. S. Investigators have analyzed the pictures and believe they show a portion of the horizontal stabilizer, a winglike part of the tail section from a boeing 777. Australia is leading the deepwater search and recovery operation spanning a 46,000 square mile area in the indian ocean, but only one piece of mh370 has been found, a section of wing known as a flapper washed up on reunion island in july. Its too early to speak on the original of the debris at this stage. Reporter they tweeted about it could belong to mh370, and just days from the anniversary of its disappearance the latest clue is a reminder that one of the worlds greatest aviation mysteries remains unsolved. I dont think we are any closer and perhaps even more confused than when this thing actually went down almost two years ago. Reporter multiple reports say gibson, the man who found this piece, is a wealthy traveler who has been searching for the aircraft, focusing on the indian ocean. He chartered a boat last weekend and found that piece of debris before turning it over to investigators. Norah . Thank you, kris. Three suspects in a brazen gun store robbery in texas are under arrest. Surveillance video captured the elaborate breakin at the houston store. The raid lasted about two minutes. Mark strassmann is at the crime scene as police hunt several other suspects. Reporter good morning. The front doors have been replaced but the crime scene tape is still up, because this is where the thieves bashed their way into the gun store and stole dozens of weapons on tuesday morning. Nothing subtle about this one. Its 4 30 in the morning and a group of thieves use a black pickup truck to rip off the doors and then scatter inside wearing hoodies and masks and gloves, grabbing as many guns as rifles as they could carry. It looks like they had something of a plan. You can see one suspect using a hammer to smash through the glass cases holding guns while others follow behind him and stuff them into bags. Another suspect seems to target the long guns right off that rack behind the counter. They took at least 50 weapons and in a little more than two minutes, they were gone. Investigators say the group switched vehicles about a block away and took off into the darkness. This was such a rush job, Police Found Weapons left behind lying on the street outside the store. Law enforcement Officials Say stolen weapons like these are often sold on the black market. Criminals buying and selling guns to other criminals. You got another criminal element that needs firearms to commit their crimes, sometimes associated with the drug trade or robberies. Reporter investigators say theres another disturbing issue gun store smash and grabs are becoming more common. We are seeing an uptick, not only here in the houston, Harris County area, but were seeing an uptick across the country. Reporter suspects will face federal gun charges. Investigators have recovered some of the stolen weapons and hope to get their hands on the rest before they can be used in other crimes. Mark, thanks. Police in oklahoma are investigating the death of a Legendary Energy titan. Aubrey mcclendon died yesterday in a fiery car crash one day after being indicted. He made a fortune as a fracking pioneer but his business is under legal scrutiny. Anthony mason is here with questions about his death. Anthony, good morning. Reporter on tuesday, the u. S. Government charged oil tycoon Aubrey Mcclendon for conspiracy for aadministrationing to limit competition. One day later, he died behind the wheel of his suv. The timing and circumstances have left some wondering if the crash might not have been an accident. Just after 9 00 a. M. On wednesday, Aubrey Mcclendons chevy tahoe crashed into the wall of an Oklahoma City highway embankment and burst into flames. He had been traveling more than 50 miles an hour. He pretty much drove straight into the wall. There was plenty of opportunity for him to correct or get back on the roadway and that didnt occur. Reporter the accident occurred one day after the former ceo of Chesapeake Energy was indicted by the department of justice, charged with conspiring to rig bids for the purchase of oil and natural gas leases in northwest oklahoma. In a Statement Issued after the indictment, mcclendon denied any wrongdoing saying, i am proud of my track record in this industry, and i will fight to prove my innocence and to clear my name. Under mcclendons leadership, Chesapeake Energy made billions of dollars and transformed the Energy Business by pioneering hydraulic fracturing or fracking. The controversial process of removing natural gas from rocks. He described it as a gold mine in an interview with lesley stahl on 60 minutes in 2010. In the last two years we have discovered the equivalent of two saudi arabias of oil in the form of natural gas in the United States. Not one, but two. Reporter the energy titan made his first billion during the energy boom. And became a partowner of his hometown nba team, the Oklahoma City thunder. But he was also dubbed americas most reckless billionaire by Forbes Magazine in 2011 for his lavish spending and aggressive risktaking. Just two years later, after Falling Energy prices sent his companys stock plummeting, he was forced out as ceo of chesapeake. Police say it could take up to two weeks to complete their investigation. But, at this point in time it looks pretty cut and dry as far as what exactly happened. Reporter mcclendon had been expected to turn himself in and appear before a judge at the Oklahoma City federal courthouse yesterday. If convicted, he faced up to ten years in prison and a Million Dollar fine. Soledad . Anthony, thank you. Astronaut scott kelly arrived back in the United States overnight after his record setting 340 days in space. His twin brother mark was among those who welcomed him home in houston. The Vice President s wife jill biden was also there. She brought him beer and apple pie. Scott kelly spoke about the future of space exploration. This mission is the latest achievement in our countrys space program. But its not the last. There will be more. Its in our dna of our country to explore and we must never stop. Scientists will study the impact of the mission on kellys body. The lack of gravity reportedly caused him to grow two inches. Well thats fascinating. Pressure on the spine. Just an incredible achievement. Amazing. You realize how much he missed beer and apple pie. Interesting combo. Fast food chains are responding to concerns about the way antibiotics in livestock can create super bugs. Ahead how restaurants announcer this portion of cbs this morning sponsored by windows 10. Upgrade today do great things announcer this portion of cbs this morning sponsored by toyota. Lets go places p. Four bandits chose a prius as their getaway car. Bravoniner, in pursuit of a toyota prius. Over. How hard is it to catch a prius . Over. This thing is actually pretty fast. Over. Very funny. Oh look, a farmers market. We should get some flowers for the car. Yeah holly toyota. Lets go places. You may think its a result of brushing too hard. 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