Announcer this is nbc nightly news with lester holt reporting tonight from havana. Good evening from a rainy havana, behind me the museum of the revolution. Just a few hours ago this communist nation welcomed president obama who is stepping on to cuban soil under a falling rain became the First American president to visit here in 88 years. As part of his twoday trip, the president will meet with cuban leader raul castro and make an address to the cuban people hoping to further nudge open doors of travel and commerce eight months after the two nations reestablished diplomatic ties. There are years of mistrust to unravel and an American Economic embar go in place. Chief Foreign Affairs correspondent Andrea Mitchell joins me with more on today. Good evening, lester. What a day it has been. President obama has been working towards date for years, an historic president ial visit he hopes will make his opening to cuba a major part of his legacy. Reporter in driving rain, president obama touched down in havana, hoping to cement his highstakes cuba diplomacy with a rare personal touch. Bringing the entire first family. Michelle obama, the obama daughters, and his motherinlaw. He immediately tweeted in local slang, how is it going, cuba. Que bola, cuba. Just touched down looking forward to meeting and hearing from the cuban people. Cuba has been painting, primping, repaving roads for weeks. Security is intense. On this palm sunday the president is visiting the cathedral in old havana, thanking the countrys Cardinal Ortega with pope francis brokered secret talks bre tween president obama and raul cass troechlt also coming here, ceos to sign deals for hotels, banking and internet service. To boost biz not the president lifted restrictions so americans can travel here easily. To reach millions of cuban tv fans he retaped a routine with cubas biggest comedy star. This is president obama. Reporter times are changing since a Young Fidel Castro launched his revolution. The u. S. Retaliated with an economic boycott. More than a half century of suspicion dies slowly. A weekly silent womens protest against rat sheem was disrupted by counterprotesters. Arrests on both sides. The u. S. And scuba still disagree over free elections and free speech. Some cubans have moved to canada but now see business opportunities. Ive may ask, why did you leave cuba . It was more about the way the country works and the way the country is run. It was more about the limitations and the loss. Reporter without widespread internet, a young blogger is hopeful. The fights between our countries many are not relevant anymore. And my generation doesnt have to pay for old grudges. Reporter overshadowing this visit, cubas frustration with the u. S. Economic embargo which congress refuses to lift. And worry that if a republican is elected all president obamas changes will be reversed a reason the president will press cuba hard this week to spiepd the pace of change. Lester. Good to have you here. Upon arrival here in cuba i spoke with washingtons top diplomat in havana, at the u. S. Embassy for decades known as the u. S. Intrasection which many saw as symbol of american resolve to undermine the communist government. I asked the ambassador what it stands for now. I would like to think it stands for the beacon of hope, a beacon of opportunity, the american way of life. It is about reconciliation, bringing people back together and looking to the future with a much more productive relationship but also one where we can have frank discussion as but ideas and issues where we do not agree such as, such as human rights. Do you have any disappointment in the skew ban governments pace of change there is still a lot of iesh us in terms of private investment, private sector here . We would like to see them move faster. In a variety of different areas. But i think we have to be patient again where, where changing relationship that had gone in one direction for a long time. Then there is the issue of the dissidents which continue to be jailed. Many people think that, having the president come here is almost a reward, an undeserved reward for the cuban government. How do you respond to that . Well, reestablishing diplomatic relations is not a reward. We feel strongly that advocating for and promoting u. S. Interests and values scan be best achieved through engagement. As some one who has deep experience in this country do you ever find yourself looking past the castros and what the future of this country might be . There will be a leadership change in february of 2018. President castro said he will step down. And so well see in the Upcoming PartyCongress Next month if there is any hint to what the transition might look like. But things are moving on. Are you optimistic . Im optimistic that we can make this relationship a more productive one that benefits americans and benefits cubans alike. Ambassador jeffrey delaurentis. Despite improving relations some are trying to leave their country, some are dying in the process. The u. S. Coast guard says nine Cuban Migrants died at sea and 18 rescued by a cruise ship. Found on a boat friday. 130 miles west of marco island, southwest, florida. Many cubans are making the journey now out of fear that the u. S. Law that for years has given cubans special immigration status will change as relations with scuba improve. New concerns were raised this weekend about violence at Donald Trumps campaign events. Specifically how his campaign and security staff are responding to protesters. The latest incident came last night and today, trump defended what took place. Our Gabe Gutierrez has our report. Reporter this weekend the anger boiled over. In tucson, a protester in a white hood escorted out by police. Another one behind him repeatedly punched and kicked by men in the crowd. That protester, brian sanders, spoke with nbcs jacob rascone. Because this Political Movement has gotten to the point where you may get beat to death inside of a rally. I just got my [ bleep ] kicked. Reporter it is this video raising even more questions. Trumps Campaign Manager, appears to grab the collar of another protester yanked away by a member of trumps private security. Today trump strongly defending him. Security at the arena, the police were alittle bit lax. He had, they had signs up in the area that were horrendous. I will give him credit. Reporter last week, a reporter from breitbart, filed a complaint accusing him off salt. He has not been charged. The long time gop rop atiff took a break to work as a New Hampshire state police officer. It is very unusual. Unprecedented for a Campaign Manager to be out in the crowd being involved in security. Ted cruz campaigning in arizona. There is now only one campaign in a position to beat donald trump and win the republican nomination. Polls show he trails trump there but leads in utah getting unlikely support from the socalled establishment. John kasich betting on a contested convention. Listen nobody is going to the convention with enough delegates. At the end i will get picked i can win in the fall. Amid reports of a 100 day stop Trump Campaign in the works here in florida the frontrunner its set to speak to local gop leaders. Tomorrow, trump will leave here and head to washington to speak at the apac conference. Some of those attending planning to walk out. Because of trumps previous controversial comments about immigration and the Israeli Palestinian conflict. Lester. All right, Gabe Gutierrez, tonight. Thank you. Officials in belgium said today the newly captured suspect in the paris terrorist attacks may have been planning more violence. Hope to learn from him what happened in paris and the broader threat from isis inside of europe. Our keir simmons reports from brussels. Reporter Salah Abdeslam arrested made gunfire and explosions. May have been planning another attack. He was ready to restart something from brussels. It maze in tis maybe the realit. We have found weapons. Heavy weapons. Reporter his knowledge of the paris massacre last november that may be crucial. Since Salah Abdeslam was discovered in this building in brussels he has been talking and there are many questions surrounding the attacks in paris that he could answer. The explosives used in the paris attacks, tatp, require an experienced bomb maker. Who was he . Where is he . According to the new york times, which says it has seen a police report, french investigators describe Salah Abdeslam as the logistics guy. So can he detail the original plan . While reports confirmed by nbc news reveal the suspected ringleader, Adbelhamid Abaaoud hid in bushes three nights after the attacks. Had something gone wrong . Ultimately he died during a paris police raid, leaving abdeslam as the only known living member of the paris cell. How much does he know . Extremely proficient at it. I dont see those people sharing old information. Reporter abdeslam relied on a Large Network of friends to stay hidden, the belgian prosecutor says. The continuing and most urgent question tonight how many more isis operatives are on the run in europe . Keir simmons, nbc news, brussels. Officials in indiana are investigating whether a distraction caused a woman to drive her car into a school bus carrying a High School Basketball team this weekend. The bus rolled over, but remarkably everyone survived. Steve patterson has details. Reporter a startling scene that seemed tragic. Oh, sweet jesus. Reporter a school bus on its back half crushed. On board, 27 passengers, members of the griffith High School Basketball team, heading to the big state tournament. Their hoop dreams side swiped by a seemingly distracted driver. Police say in the next lane, a 23yearold driver lost the lid on her drink, spilling it losing control of her car swerving it into the side of the bus. My buddies on the ground, cant move, cant walk. It really hurt. Reporter a surgeon from North Carolina who happened to be driving by stopped to help. Honestly, even as a Trained Health professional, you see upside down school bus its, every parents worst nightmare. And you fear goes through you, horror. Reporter police are investigating the crash and no one has been charged. Remarkably no one suffered life threatening injuries. Today, a Prayer Service in th k thanks instead of mourning. The prayers have been answered, obviously. Because we are all walking. We are all talk which matters. Reporter not exactly the homecoming they were planning but one they will gladly accept. We are going to try to recuperate to bring a state ring possibly back here. Th thats the main goal. Reporter with big dreams still to strive for. Steve patterson, nbc news. What an awful sight to see a crumpled school bus like that. A close call on the road today. This one at 200 miles an hour. Spanish driver clipped the end of another car at australian grand prix in melbourne. His car careened off the track, flipped twice, went airborne and broke apart before coming to a stop at a safety barrier. The driver shaken up, but amazingly able to walk away from the crash. Incredible. On this first day of spring, we are watching a winter storm as it brings snow to the northeast tomorrow and into this evening. Lets get the latest. We have Winter Weather advisories and warnings across the northeast, especially across new england. Where we will see most of the higher snowfall totals. The storm will strengthen out over the water overnight. The mid atlantic brushed by the western side of the storm. We go through the morning. Southern new england will see heavy pockets of snow. Moves up into maine by early afternoon monday. New york area, just about an inch on grassy surfaces. Farther east, higher the snowfall totals will be. 6 to 10 inches, southeastern mississippi. Up into down east maine. Washington, d. C. , new york, i dont see a lot of travel troubles early tomorrow morning. Head into new england, could see troubles until noontime. Then this whole storm system will race away by the time we go into sunday afternoon. Lester. All right, suddenly this rain doesnt seem so bad around us. When nightly news continues on this sunday, they made it to italy. We will tell you why the migrants still feel dangerous close by. Later from here in havana, meet a wom why do some cash back cards keep throwing obstacles at you . First they limit where you earn bonus cash back. 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We get more from sicily and bill nealy. Reporter in the dark heart of sicily near the mafia stronghold of corleone, new muscle works the land. Migrants have taken over vineyards confiscated from jailed mafia bosses. They fled violence and poverty at home, to work in a place that is known for both. But here they are paid, fed, and clothed. Many though were afraid to be identified, afraid of mafia vengeance. From time to time you feel a bit scared . Some times i feel scared. You are looking over your shoulder . I am alone here, maybe, maybe sometimes we fear. Reporter many migrants already know mafia or at least the word. It is originally arabic, meaning a place of refuge which is what they have here. Safety in mafia country. For now. Hired from refugee camps, they now live in houses once owned by mafia leaders. Like toto the beast rena. Jailed for dozens of murders. Men who may one day want their land back. Corleone. I tried to protect the guys. I tried to protect myself. Reporter in corleone, they sell the wine from the migrants vineyard. But not everyone is buying. Mafia ties run deep here and sicilys war against the mob is far from won. The mayor of the capital, compares the mafia to isis. He is heavily guarded, supports the migrants, loathes the mafia. I am the boss against the boss of the mafia. Reporter the mafia is not dead. Hundreds more migrants landed in sicily in recent days. Authorities want more of them in the mafias old killing fields. The godfather is behind bars can do little as the migrants work their land and watch their backs. Bill nealy, nbc news, sicily. Next here tonight, theyre a family of four. Family of four. Now the newes family of four. Now the newes toilet flush if you need an opioid to manage your chronic pain, you may be sooo constipated it feels like everyone can go. Except you. Opioidinduced constipation, oic, is a different type of constipation, which may need a different approach. Longing for a change . 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