Subject of a closeddoor meeting today in washington, called by anxious conservative leaders. The purpose, building a strategy to block his path to the nomination. Nbcs Hallie Jackson takes us inside the effort to derail trump. Reporter today two blocks from the white house, a secret huddle on how to stop donald trump from moving in. A frustrated group led by eric erickson, emerging with a call for a unity ticket for the gop and looking ahead to a contested convention. The stopTrump Movement regrouping to reassess how to slow him down. Two road blocks slowing them down. First, trump could still lock up the nomination before the convention. Ads against him not doing much, as he more than doubled his delegate lead this week, even after outside groups spent 13 million. Now were having conversations with donors, gauging the interest in moving ahead. Reporter antitrump activists delegates to be the convention. Real people with lives and schedules and vacations and cell phones and twitter accounts all have to be found, cataloged, and wooed. Reporter the message to them, in the words of one activist, people who bultd this party have been here longer than the newcomers who are threatening to burn the whole thing down. Those of us who are delegates in colorado. Reporter the second issue for the stopTrump Movement, calling for unity without special vying to the party. New signs cruz may have the edge. Marco rubio, praising him as conservative, though ruling out a vp run. Senator Lindsay Graham planning to raise money for his colleague just a few weeks after this. If you kill ted cruz on the floor of the senate, and the trial was in the senate, nobody could convict you. Reporter the unlikeliest of pairing one the stoptrump Movement Never saw coming. And late tonight, a hacker group trying to stop trump is reportedly taking credit for the release of his personal information online, his phone and Social Security number. The Trump Campaign tells nbc, Law Enforcement authorities are seeking the arrest of the individuals responsible for attempting to illegally hack the candidates account. Hallie jackson, thank you. The u. S. Is now officially de chaired isis guilty of genocide. Secretary of state john kerry today formally accused isis of the crime of trying to ex terminate entire peoples, including christians, and ziite mufls. Congress has been pushing for this designation, but it is now not expected to change the current u. S. Strategy against isis. For the first time, were hearing from the man that kurdish television said is the alleged american isis fighter who suddenly surrendered last week. Hes revealing details about the dark path that led him from virginia all the way to the heart of territory in iraq. Nbc news chief attorney correspondent Richard Engel has more. Reporter the first americanborn isis fighter to surrender on the battlefield. Im from the united states. Reporter the 26yearold virginia native was captured this week in iraq. Today his kurdish captors released video of his confession. I was with a lot of foreigners, a lot of asians, russians, and people from the surrounding area. Reporter he described how he traveled to turkey, and over the course of a few months, entered syria to join isis. His statements were made while hes still in captivity. They cham he tried to leave isis from where he was stationed in the iraqi city of mosul and surrendered to kurdish forces. I didnt support their ideology. Thats when i decided i needed to escape. I wanted to go back to america. The life in mosul, its really, really bad. Reporter he said he realized his mistake in joining isis. U. S. Officials say the group is having trouble keeping its recruits, and that he could be of intelligence value. Amazing to see him speaking so openly. Richard, thank you very much. President obamas nominee for the Supreme Court, Merrick Garland, made his first visit to capitol hill today hoping to meet with as many senators as he can. But hes had no meetings with republicans yet. Some now say theyre open to the idea. But the gop appears to be Standing Firm on denying him a vote. Nbcs Pete Williams went to get answers on the hill. Reporter theyre calls, Merrick Garland may find courtesy in short supply at the senate. So far democrats have formally agreed to meet with him, including harry reid and patrick leahy. Democrats are highlighting their meetings to push for a hearing in a vote, though republicans say neither will happen. Do you think that could be changed . I hope it will be changed. Because i cannot imagine any senator standing up and saying, im not going to do any duty. Reporter eight republicans are open at least to meeting with garland, though some say that may not be productive. Im not going to change my position, because its based on the principle of this nominee having the possibility of reshaping the court for generations. I think its best to allow the American People to weigh in on that. Reporter no commitment yet from other republicans who voted 19 years ago to done firm garland as an Appeals Court orrin hatch first raised the possibility after the president ial election, but no longer, now in line with his party. The right thing to do is put this over to the next president. Reporter the real concern, antonin scalias death leaves the Supreme Court ideologically split, so any obama nominee would move the court to the left. Even a moderate like Merrick Garland who hopes hes doing more than going through the motions. The white house hopes to keep the pressure on with proconfirmation cities. In a Conference Call today with supporters, president obama said, Pete Williams at the Supreme Court, thank you. Still ahead tonight, accidental poisonings in children. A danger in so many homes, that its sending kids to the emergency room every nine minutes. A new warning every parent must hear about the risk of sdeptd al poisoning for children. Almost every minute of every day in the u. S. , a call is made to poison control because a child got into medicine they shouldnt be taking. The rated of kids being rushed to the e. R. Is staggering. Reporter robert lee called 911 just once in his life. For his daughter, katherine. I heard a crunching sound. I knew she had accidently gotten one of my pills. Reporter robert takes several heart and Blood Pressure pills a day. Its not clear which one katherine ate. I felt scared and guilty all at the same time. Reporter every nine minutes a child is rushed to the reflt for accidental poisoning. A key factor, nearly 60 of adults take at least one prescription drug. Almost 80 use overthecounter medicines. Kids have more exposure, particularly in multigenerational families. 48 of the time a child who is treated in an emergency room had gotten into a grandparents medication. Reporter easyopen pill boxes like these are convenient for adults and a major hazard for children. Of children brought to the reflt for possible medicine poisoning, safe kids worldwide found most medicine in a pill box, on the floor, in a purse, or right on the counter of the experts take all medications should be stored out of sight of children and out of reach of children. Reporter katherine waste hurt, but learned a lesson. So now when you see Something Like this, could you eat it right away . No. What do you do . You think about it, and like turn away if it looks like medicine. Reporter a remind efor families everywhere. Erica hill, nbc news, columbus, ohio. Snnchts when we come back here tonight, the new claim that a drug a new study finds that the main ingredient in many popular pain relievers like tylenol may not help at all when it comes to relieving arthritis. The study found that antiinflammatory drugs like ibuprofen work better but should short term. The makers of tylenol disagree with the study, saying the drug is safe and effective. Frank sinatra jr. Has died. The son of the legendary singer followed his father in the music business working for him as his musical conductor. He performed many of the classic favorites. He made International Headlines in 1963 when at 19 years old, he was kidnapped for two days, until his father paid a 240,000 ransom for his safe release. The family said he died of cardiac arrest while on tour in florida. Frank sinatra jr. Was 72. Scary scene caught on camera today at a High School Pep rally in florida. It happened when a seasoned stunt performer was going to blow fire at the rally, accidently caught fire himself and suffered firstdegree burns to his face. He is expected to be hospitalized overnight. Several students were treated for breathing the wait is almost over for two expectant parents in washington, d. C. A pair of bald eagles are waiting in their nest for two eggs to hatch. It wont be long now. A tiny break has started cracking through one of the shells. It promises to be quite an amazing sight for all of those who will be watching the live nest cam feed. When we come back, dog overboard of the she was lost at sea five weeks ago. But her incredible story of survival has were going to leave you tonight with a story of survival against all odds. A beloved friend lost at sea more than a month ago and feared dead. She must have one heg of a dog paddle going on, because amazingly this dog lived to see another day. Nbcs Gadi Schwartz has the details. Reporter its a sea dogs tale of survival. A wagging tail of survival. I was just blown away. I still get chills just looking at her. Reporter this is 1yearold luna after after being lost at sea. I cant believe its her in the flesh. Reporter friends of lunas owner say she was on a fishing boat in february when she disappeared. After a twoday search they finally assumed the worse. You can imagine trying to search for a brown and tan dog on a brown and tan shoreline would not be an easy thing. Reporter her owner posting a goodbye on facebook, when he got the call. Surviving on rainwater, fish and rodents rodents. Shes thin, but shes not emaciated. Reporter luna was spotted sitting on the side of a deserted road. Her ocean blue eyes made her an instant favorite among the sailors. Good to get her back to her owner. I cant believe shes back. Reporter the navy making luna an honorary dog tag inscribed with a lesson usually taught to navy s. E. A. L. S in a special survival luna, keep the faith. Gadi schwartz, nbc news, los angeles. Apparently swims like a retriever. That will do it for us on this thursday night. Im lester holt. It is e friday, march 18th. Coming up on early today, is old man winter go having another massive winter . And a mounting effort to stop donald trump in the race for the white house. Plus, soon every car in the land will have this special safety measure. March madness is in full swing, plus a whole lot more as we head into the weekend. Early today starts right now. During a congressional hearing over whos to blame over the toxic water crisis. And the calling for heads to roll, nbcs stephanie gausk reports. Reporter with the children of flint still unable to drink the water. On the hill. If you want to do the curages thing, then you two should resign. People who put dollars over the fundamental safety of the people do not belong in government and you need to resign too, governor snyder. The head of the epa and governor of michigan were hammered over the led in flints waiter. You need to take responsibility because you screwed up and messed up 100,000 peoples lives. Reporter every resident in levels of led while officials insisted it was safe. But the democrat from pennsylvania hit back hard. You not in a medically induced coma for a year. And ive had about enough of your false contrigz and your phoney apologies. Epa head mccarthy. I wish we had yelled from the tree tops but there is no way my agency created this problem. Reporter more than 150 residents from flint bused in overnight for the hearing. We cant brush our teeth. We cant just use the faucet like we are do here in washington. Reporter for some it still lingers after they were so badly letdown letdown. We are hear for the first time from the first known isis fighter known to surrender on the battle field. Americanborn son captured this week in iraq. He said he made a quote bad decision to faulto a young woman from turkey to syria and then mosul iraq. And they have released a vid quo eo of his confession. I was with a lot of foreigners and people from the surrounding area. I didnt really support their ideology and thats at that point, thats when i decided i needed to escape. I wanted to go back to america. My message to the American People is the life in mosul its really, really bad. It is unclear if wesz is returning to the u. S. Or will be prosecuted. Meanwhile, the new york pizzeria owner who admitted he been sentenced to 22 1 2 years in prison. Previously pled guilty to providing Material Support to isis. He was the first man captured and convicted of supporting isis in the u. S. And iraqi born palestinian has been indicted on trying to support isis. This comes two months after he was arrested and accused of lying about traveling to syria. He faces a total of 15 years in prison. It is a flight 55 passengers and crew wont soon forget. It was struck by lightning and had to make an Emergency Landing at nearby jfk. It was circling when it hit turbulence and it left passengers stunned. It was just such a loud bang, it was like a if i recollect, you know so happy we all landed safely. And we were saying to each other, we made it. Yes, they did. The plane landed safely and no one was hurt, the faa is investigating. And to the increased support of a stop Trump Movement among conservatives. Reporter two blocks from the white house a secret huddle on how to stop donald trump from moving in. A frustrated group led by inflew influential contrv servative looking ahead to a contested convention. Theyre reassessing how to slow him down. Two road blocks slowing them down. First, trump could still lock up the nomination before the convention and he more than doubled his delegate lead this week. Conversations with donors. Reporter antitrump activists to convince delegates to fight the frontrunner at done contested convention. Its people who built this party have been here longer than the newcomers threatening to burn the whole thing down. And calling for unity without specifying who they should unify behind, john kasich and ted cruz. Marco rubio praising cruz as con conservative and senator lindsey gram saying he would raise money. If you killed ted cruz on the floor of the senate and the trial was in the senate, nobody could convict you. Reporter the unlikeliest of pairings, one the stop trump Movement Never saw coming. Bernie sanders has the missouri primary to Hillary Clinton. Aparent leading by roughly 1500 votes. He said even though hes behind in total delegates by a wide expect him to drop out. We think if we come into the convention in july in having won a whole lot of delegates, a whole lot of momentum behind us and most importantly candidate who is most likely to defeat donald trump. We think some of these ave now supported Hillary Clinton can now come over to us. All eyes turn to next tuesdays contest. Utah and idaho as wells americanmowau. Its interesting to note that utah will be offering online voting for their republican caucuses for the first time. Supreme Court Nominee merrickking the