For health care, a new way patients are finding to save big money, on average 1,000. Well show you. And story time. But its the kids doing the reading and some very good listeners loving every minute of it. Nightly news begins right now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. It is like nothing weve seen before in modern american political history. Mitt romney, the republicans last president ial nominee, delivering a stinging pointbypoint takedown of his partys current frontrunner, donald trump. Reaching a new level of urgency with romney in a speech at a time that sounded like an intervention, labeling trump a phony, eviscerating his policies as reckless. Warfare over the Republican Party. We start with peter alexander. Reporter romney branded his frontrunner, as dishonest, dangerous and dumb. Heres what i know. Donald trump is a phony, a fraud. His promises are as worthless as a degree from trump university. [ cheers and applause ] reporter the Republican Party vilified the man to succeed him. You say, wait, wait, wait. Isnt he a huge Business Success . Doesnt he know what hes talking about . No, he isnt. And no, he doesnt. His bankruptcies have crushed small businesses. And the men and women who work for them. He inherited his business, he didnt create it. And whatever happened to Trump Airlines . And then theres trump magazine, and trump vodka, and trump steaks, and trump mortgage. A business genius he reporter repeatedly blasting the billionaire for lacking the temperament to be president. Think of Donald Trumps personal qualities. The bullying, the greed, the showing off, the misogyny, the thirdgrade theatrics. Reporter accusing trump of manipulating the public anger. He creates scapegoats of muslims and mexican immigrants immigrants. He knew if it wasnt going to happen today, it probably wasnt going to happen. Reporter four years ago, romney welcomed trumps endorsement. Today tweeting trump wouldnt have accepted it. If not trump, then with who . I vote for marco rubio in florida and john kasich in ohio and for ted cruz. Reporter could romney jump in . We tried to get his attention, but no response. If its trump, this dire prediction. A person so Hillary Clinton must not become president. [ cheers and applause ] reporter peter znd, nbc news, new york city. Will he talk about our policy differences . Or will he attack me with every imaginable low road insult . Reporter and donald trump delivered. Ill just address it quickly because its irrelevant. If i said drop to your knees, he would have dropped to his knees. Reporter back at the name calling today. Artist. Reporter a sentiment about romney echoed by trump supporters. Hes a loser. Reporter the former nominee now daring the potential nominee to be transparent. All he has to do is release his back taxes like he promised he would. Reporter a demand trump ignored. Taking fire offstage, about to face it onstage. Tonight his toughest rematch yet. First time in eight months. The billionaire trashing kelly after she asked him about his own words insulting women. You call women you dont like fat pigs, dogs, slobs, and disgusting animals. Your only rosie odonnell. Reporter tonight sure to get heated. What is your plan . Reporter aides to marco rubio promising the senator will expose the billionaire for his policy shortcomings, and will get personal if he needs to. Trump now on the air at rubios home state. Sending 1 million on florida tv. The Cruz Campaign down less than 100 delegates, said the texan wont get in the mud. They said act president ial tonight. I said, if somebody hits me, im going to hit them back harder. Reporter john kasichs camp said theyll try to stay tonight. Donald trump has the most to lose. Katy tur, thank you. We want to bring in our political director, the moderator of meet the press, chuck todd. What just happened here . I can tell you this, the other republican campaigns who want to stop trump are a little disappointed that mitt romney didnt offer a solution. They fear his resolution is raising his hand and say, hey, im available in case of an emergency. Nomination away. If he loses both florida and ohio march 15th, chances are were heading to the contested convention. Rye now, trump leads in the delegates, as katy said, a little less than a hundred. So far, trump has won about 45 of all the delegates available. Lets assume trump can win that same 45 in the 14 contests ohio. Well that means hes really got to do well in florida and ohio. Florida and ohio, this is what delegate totals look like. Nearly 300 delegate lead over cruz. He only needs to win 50 of remaining delegates to be the nominee. Without rubio and drop out, that wouldnt be the case. But if he loses both, florida and ohio to kasich and rubio, then suddenly you have a jumbled mess. Everybody stays in, and lester, were headed for that contested convention. Wow. Chuck, thank you. We want you to know mitt romney will speak out live tomorrow morning in the studio here in new york. An exclusive interview with matt lauer on today. You think Hillary Clinton might be sitting back today, gleefully watching whats happening on the gop side, but she has got potential trouble of her own. Namely, this email controversy that repeatedly surfaces. This time, word that the aide who set up her private email server has been granted immunity. Thank you all so much reporter Hillary Clinton at a starstudded go out and vote reporter at the same time as a new disclosure about the investigation into her emails. Nbc news confirming the former aide that set up her personal server has been granted immunity by the Justice Department. Bryan took the fifth before congress but now talking to the fbi. Spotlighting an issue donald trump raised again today. Assuming shes not arrested for the email situation. Reporter key legal issues with classified information mishandled. What was the damage . What was her role . The overriding legal issue is what was done at her direction and what was done with her knowledge. Reporter the fbi director has taken charge. I am very close personally to that investigation. Reporter today clintons spokesman said shes eager to be fbi. Calling secretary clinton in to answer final steps to helping investigation. Reporter a controversy that has clouded secretary clint for a year. Bernie sanders gave her a pass on the issue last fall. And today his wife and adviser told me maybe more people are interested now. But were not going to make an issue out of it. Reporter it is likely clinton will have to testify. Her team says theyre glad her former aide is now cooperating, but clearly no matter what the Justice Department decides, this is an issue that the republicans will continue to use against her. Lester . Andrea, thank you. There are new defendants tonight involving that piece of debris discovered off eastern africa. Possibly belonging to the missing Malaysia Airlines flight 370. Malaysian authorities reiterated today that photographic evidence suggests it likely came from a boeing 777. Were hearing more from the american who found it. Heres nbcs tom costello. Reporter the photographs of the possible debris found why is there no marine life like the last piece. It is possible it korv washed clean if it was stuck in the sand. Yet the words no step is still visible. Crash experts say it suggests a violent impact with the water, but theyd expect to see a relatively flimsy horizontal stabilizer on a 777 rip off first. I cant assume at all it has to do with mh370. Reporter it was found by blaine allen gibson. This could possibly be from malaysia 370. We dont know yet. Reporter gibson has blogged about mh370, even traveled across asia meeting victims families. Today he said his interest drew him to the beach. I wanted to go out to a place where debris washes ashore from the open indian my heart was thumping. Anticipation, there was excitement. Reporter while the still thousands of miles away, marine experts arent surprised debris has turned up on the other side of the ocean. The ocean is much complicated than a straight flowing river. You get swirls, you get big waves. Reporter even if investigators conclude the debris is from mh370, it wont tell them where the rest of the plane is. The search remains focused some 3,500 lester. Tom, thank you. A surprise announcement today from american soccer hero brandi chastain. Many remember her iconic world cup victory celebration. After years of taking hard hits, she will donate her brain to science, warning about concussions to women and girls. That its not just a concern for guys playing football. Nbcs erica hill has more. Reporter the woman behind one of the most sports history is hoping to leave a more lasting legacy. Pledging today to donate her brain for research. Chastain spoke to nbc news about head injuries last november. When you hear things like cte, traumatic brain jury, these are real. These are longlasting. And what we cant do is we cant study the brain while somebodys alive. Reporter her brain will go to researchers at boston university, studying chronic traumatic encephalopathy, or cte, and a possible link to concussions. The lab has 307 brains. Only 7 are from women. We really dont know about cte in womens sports. We need more spes i mens. We mead nor ways to diagnose is. Reporter chastain, who retired from soccer in 2010, estimates there were probably half a dozen times she shook off possible concussions from heading the ball. Second highest number of concussions among high school athletes. With female players suffering 40 more than their male counterparts. Now a mom and coach, chas tape worked with u. S. Soccer last year to change the rule for heading in youth league. As a coach and advocate and soccer ambassador, i have to do whats right for the safety of the players. Reporter continuing her commitment to the game, and its future. Erica hill, nbc news, new york. A criminal investigation has been launched over a troubling scene caught on tape in baltimore. It shows a School Police officer slapping a young man in the face multiple times, and then kicking him. Its just the latest incident raising questions about the use of force among baltimore law enforcement. Nbcs ron mott has the story. Reporter tonight an investigation is under way in baltimore over this foursecond cell phone video, showing a School Police officer 16yearold boy while a second officer looked on. As a parent of a Baltimore City school student, i was appalled by what i reporter the mayor, whose city is closely watching a series of criminal trials of Police Officers in the death of freddie gray, found it exasperated by another policeinvolved controversy. Officials say the two officers were responding to a report of school intruders. But a lawyer put the 10th grader and his family told nbc news he is enrolled as a student there. The child and family want to keep their names private. Hes a minor child. He was injured and his family is traumatized by what happened. In 2014, another Baltimore CitySchool Police officer was seen on camera hitting a female student with a baton. The officer later pleaded guilty to assault. The City Schools Police chief said hes also troubled by what he saw. According to our use of force, definitely excessive statement, the States Attorneys Office said it takes this matter very seriously and is working closely with the citys Police Department and School Police to investigate. Those forces operate separately. Law enforcement in baltimore once again making headlines. Ron mott, nbc news. Still ahead tonight, slashing doctor bills by thousands of dollars. The website making discounts on medical services as easy as booking the cheapest flight online. Also, story time. Kids testing out their driving out on the open road together is great. But i think women would agree, getting home. To cuddle up with their man is nice too. But heres the thing about half of men over 40 have some degree of erectile dysfunction. Well, viagra helps guys with ed get and keep an erection. Is healthy enough for sex. Do not take viagra if you take nitrates for chest pain or adempas for pulmonary hypertension your Blood Pressure could drop to an unsafe level. To avoid longterm injury, seek immediate medical help for an erection lasting more than four hours. Stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. Ask your doctor about viagra. There was a new way to combat the skyrocketing cost of doctors bills. Its easy as a few clicks on a computer. A startup saving thousands of people by letting them browse for medical services, the same way you might look for a bargain airplane ticket online. Olivia stearns has more on our series, the price you pay. Reporter every fall, John Wakefield goes hiking with his buddies out west. But last year his back was hurting. So he decided to get an mri before the trip. I wasnt going to be caught in the woods with, you know, back issues. Reporter in tampa, where john lives, an mri costs on average 1,700. With his insurance deductible, john would have had to pay all of it out of pocket. But then he found an amazing deal. I paid 450. Reporter john used a new online marketplace called save on medical. Almost like expedia reporter heres how it works. Simply choose your procedure, enter your zip, and a list of providers pops up alongside ratings, reviews, and most importantly, price. Matt schneider is the ceo of save on medical. Those who come to our site want to pay for a howard johnson, but want to stay at the ritzcarlton. Reporter prices can vary in one neighborhood. The typical price in the area is 1,509. The average patient can save 69 . How did you get the providers to bring down the prices . Theyre doing that because they want to sell their excess capacity. Same way in hotels, and in the travel industry. Works in 39 states. So far, theyve helped out 30,000 patients, each saving about 1,000. Mostly on mris, cat grams. As for john, its a lot of extra money and peace of mind out on until now, consumers really have been in the dark about health care costs. 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Reporter which is of missouri is pulling out every trick in the book. At this st. Louis shelter, kids volunteer their time reading to pets that are waiting for a good home. They call it the shelter buddys reading program, an idea that started around christmas and quickly took off. I personally love animals. Theyre my favorite things in the world. Reporter the children are actually trained to seek out anxious dogs by reading their body language. Its amazing to see the reaction of these dogs. In almost every situation, they come from the back to the front to greet the kids. Reporter the more these dogs learn to engage with people, the better their chances of adoption. I think they really enjoy it, because theyre getting to interact with people. Reporter and the kids get something out empathy. A winwin situation thanks to an unconventional even biscuit is looking a lot more confident. One of many precious pups ready to close the sale and make a lifechanging connection. Joe fryer, nbc news. We want to tell you that biscuit is still at the shelter and up for adoption at the Humane Society of missouri. But i have a funny feeling not for long. Thats going to do it for us on a lights, camera, access. Allowing him to call in to every show. Mitt romney is a stiff. I think that a nono. Donald trump is a phony, a fraud. The ultimate perfect storm hits tonights debate. Im billy bush. Trump versus megyn kelly rematch, mix in mitts targeted move to dump trump and add to