Arrived, as he now prepares for his historic speech to the people of cuba. Tonight, donald trump with. Defending his supporters. What hes now saying tonight, and we ask president obama about trumps prediction of riots, if the Republican Party tries to stop him. Good evening tonight from havana, where we witnessed and historic moment today. President obama standing side by side with cuban president raul castro. Saying, the United States and cuba are no longer enemies. A thaw, decades after the cold war ended. But there were tense moments today. The two leaders did not always see eye to eye. There was the hand shake between the american president and the president of cuba, and then a private meeting between the two. And then, a very rare, a true conference. Raul castro taking questions along with president obama. Criticism of the United States. And, in another unexpected moment at the end of the News Conference, raul castro reaches for president obamas arm there. It made for an awkward moment, with much of the world watching. A short time after arriving here in cuba, our exclusive walk with president obama, through old havana. And, tonight, right here, our new interview with him. We sat down with him just a short time ago, after his meeting with raul castro. And we begin tonight with what it was like in that room. You have said that you would speak candidly with president castro about the serious differences you have with the cuban government, particularly on human rights and on democracy. So, take us inside that room today. What did you tell president castro that needs to change here in cuba . Well, what i indicated to him was that, for 50 years, they have used american aggression, or interests in regime change, to guard against dissent inside of cuba. And as normalization occurs, that excuse is taken away. What i indicated to him is that we cant force changes on cuba, but what we can do and will continue to do is to stand up for the rights that we consider to be universal. President castro late today said, give me a list of Political Prisoners and ill release him. Weve given him lists in the past. And they have responded intermitt endly to our engagement. You were in that room. Do you trust president castro . Do you believe that he truly wants change here . I believe that president castro truly wants change. I do not believe that president castro wants to upend the ruling party or the system that they have. President castro seemed to be defending himself, his record on further, saying, i find it inconceivable that the government does not find. What did you make of that . Well, look, this is an argument that i think the cubans make whenever they hear criticism from the United States. Their argument is that, okay, we may be in your view short on some democratic practices, on the other hand, you guys still engage in the death penalty, or racial discrimination, and theyll tick off a list. But when he says health care, does he have a point . Well, heres the point. We should not use our shortcomings as a way of deflecting the kinds of repression that happens here. But two making history, standing side by side. Raul castro, taking questions. Obamas arm unexpectedly. If you think about todays press conference, as far as i can tell, that may be the first time that raul castros ever stood in front of not just u. S. Press, but also cuban press and answered questions. And that could not have happened unless we had changed this policy. You plan to meet with dissidents here. Yeah. Did you choose the list . Absolutely. Did cuba have a hand in it . No. We were very clear were going to meet with who it is we want to meet. By some estimates, 1,400 people arrested in january alone, setting a new high. 500 of them, women. In fact, the arrests are higher since you announced normalizing relations with cuba. Right. Even arrests as you were arriving here. Does that concern you . Well, it does concern me, and, you know, my view is that people have a right to express their differences. Now, one of the things i said to believe in this, is that if they were less fearful of dissent, that not only might they be able to improve governance here, but i suspect that they could enhance their legitimacy in the eyes of the cuban people. Will you meet with fidel castro . You know, if he his health was good enough that i could meet with him, id be happy to meet with him. Just as a symbol of the end of, or the closing of this cold war chapter in our mu watch ll histories. Its not clear to me what the state of his health is. So, it could happen. I have no idea. So Many Americans back home are asking us, whats the bottom line here on tourism in cuba. A lot of families want to come visit, not as a one to one exchange, but to smoke a cigar, go to the beach. When do you see that happening . Happening very soon. The changes we made allow individuals now to come here for educational purposes. We now have an agreement where cruise lines can travel from the United States directly to havana. We have now direct u. S. Flights to cuba. Which will make it much easier to travel. But inevitably, its going to happen, and when you think about the proximity, it took me no longer to goat havana than it does for me to get to miami, have from washington, d. C. Calvin coolidge took a battleship to get here. Back home, it is spring break season. A lot of children are back home with their parents. You brought the first daughters with you. Yeah. Im curious what you have told them about the history their witnesses. Their generation will not see cuba in the same way the rest of us do. Its really interesting. You know, last night at dinner, we talked about why it is that cuba occupied such a special place in the imagination of for them the cuban missile crisis and how close we came to a nuclear ka catastrophe. We saw the image of malia helping you with spanish. Her spanish is much better than mine. And im hoping that she has a chance to get entirely fluent. One of my big regrets, that i was too much of a goofoff in school to really perfect my spanish. The president and his daughter doing the translating in old havana. But back to that tense moment here today, two leaders forging a new partnership, but clearly not agreeing on everything. President castro denying that cuba holding Political Prisoners, and as you heard him say, he said, give me a list. Government here till still right toly controlling dissent. Arrests just as president obama was arriving here tonight. Tomorrow, the president meeting with dissidents. Abcs Jonathan Karl melt with get their moment with president obama. Jon with us in cuba tonight. Jon, you heard castro say, give me the list, ill release him. Reporter david, the simple fact is, cuba does hold Political Prisoners, in fact, just yesterday, only a few miles from this spot, 50 people, most of them women, were arrested as protest. The three dissidents who i met with earlier today on the outskirts of havana know something about this. The three of them have spent a jails. And david, they told me today here in cuba has gotten worse over the past year. Jon karl with me here in cuba. Jon, thank you. And much more from cuba later in the broadcast, including, when will americans be able to come here simply as exchange. And the American Hotels tonight, plans. Tonight. But from the political headlines here to the race for the white house back home. Tomorrow, voters head to the and tonight, donald trump in washington, defending his supporters, and the fights, the violence breaking out at some of his rallies. Trump turning the blame for this incident in tucson back on the protesters. Tonight here, i ask president obama who he makes of trumps prediction, possible riots in contested convention. How the president responds in a moment. But first, abcs tom llamas on the campaign from washington. Reporter today, mr. Trump goes to washington, working the city he hopes to call home. His motorcade pulling in for a meeting with influential republicans. Some, including newt gingrich, do you endorse him . We had lunch. Reporter ducking reporters on the way out. We had a great meeting. We had a really good meeting. Reporter the businessman today presenting himself as trump the statesman. But forced to answer questions about his violent rallies. This supporter arrested after punching and stomping a protestor in arizona. Trump defending the mans infuriated by another a protesters dressed in a shake shift kkk outfit. This is an africanamerican man who is a supporter, who has a great family and he has had enough. And ill be honest with you, in this country, on a larger scale, the people of this country have had enough. Reporter ever the showman, Trump Holding his News Conference at his new hotel nobody asked about the hotel. Reporter even offering a job to an out of work veteran in the crowd. If we can make a good deal in the salary, shes going to probably have a job, okay . Reporter tonight, trump has to close a much tougher deal. Appearing before the proisrael apac conference. Hillary clinton today, seizing on trumps previous statement that he would be, quote, neutral when negotiating mideast peace. We need steady hands. Not a president who says hes neutral on monday, proisrael on tuesday and who knows what on wednesday, because everythings negotiable. Clarifying his position. I would love to be neutral if its possible. Its probably not possible. Because theres so much hatred, theres so much going on. I am very proisrael. Reporter david, like trump, Governor John Kasich and senator ted cruz will also speak tonight here at aipac. They both want to take this race all the way to a contested convention in july. Trump tells me today that hes ready for that. He has a professional team in place, and a plan, if it has to come down to that. David . Tom llamas with us from washington tonight. Tom, thank you. I did ask president obama about donald trump, and talk of possible riots. Heres what the president said. I wanted to ask you about the Political Climate back home, because it is back in the news again today. Youre aware that donald trump has predicted riots if the Republican Party tries to stop him, if theres a contested convention, saying, i think youd have riots. Im representing many millions of people. Predicting riots. Im curious what you make of well, this is an issue that the Republican Partys going to have to work through. Ive made very clear my view that there are boundaries to our politics that make our democracy work. Did he cross that boundary . I wont comment on any specific thing that mr. Trump or anybody else said. Theres an, expectation that our leaders will not trumpet violence violence, or justify it. Theres an expectation that those who run for the highest office seek to represent everyone, and not just some or appeal to an us versus a them, that there is an importance for us to be able to disagree president 0 obama weighing in home. To belgium now, and chilling new clues from the interrogation of that suspect in the terror new images tonight of the raid that took him down. Several suspects fleeing the police, shots fired. The suspect believed to be Salah Abdeslam taken into custody. Authorities already learning there may have been other terror attacks in the pipeline. We turn to the weather tonight, and to the nasty blast of winter, kicking offspring. Snow from new jersey to maine, and a chill across the east coast. Heavy, wet snow sparking a power line on new yorks long island. A messy morning commute in massachusetts. A school bus sliding into a snowy ditch in maine. Rob marciano with the forecast, the track of this, from boston tonight. Rob . Reporter hey, david. The snowstorm this morning has led to a sunny snowmelting afternoon, and the outfield showing again here at fenway. Temperatures going to drop again below freezing tonight, not just here, but across the deep south. Frost and freeze advisories into florida. Rebounding on wednesday near 70 in new york, 84 degrees this dallas, in advance of our next middle of the country by midweek midweek. By the way, home opener here, thee weeks away, david, they are hoping for less white and more green. Rob marciano with us from boston tonight. Rob, thank you. And there is still much more ahead on world news tonight this monday. Apples new reveal tonight. The new iphone, they say, with even better security. The major changes. And the important tip for families at home tonight. The one simple step you should take right now to make money off of your old iphone. Also tonight, the new warning about drowsy Truck Drivers all around you. The common medical condition blamed for so many crashes on the road. And the emotional reunion here in cuba. The professional ball player, home for the First Time Since leaving cuba for america. Well be back with this special edition of world news tonight from havana. I accept i do a shorter set these days. P i even accept i have a higher risk of stroke due to afib, a type of irregular heartbeat, tnot caused by a heart valve problem. But i wont play anything less than my best. So if theres something im going for it. Eliquis. 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We need to decide as a nation how much power the government should have over our data, over our privacy. Reporter it is an uncomfortable position for americas most valuable company, which today launched its latest new phone, dubbed the iphone se. This is the newest iphone, the se. The first thing youll notice, it looks like the old iphone 5 s. Look at it compared to my iphone 6. The new phone is a lot like older iphones in look and feel, but with better cameras, faster speeds and, again, better security. And all those old phones are worth serious cash. A site called flipsy claims to look at all of the offers for your used phone and find the best option. Our iphone 6 in decent shape fetched anywhere from 40 to all but you better do it fast. The price drops as soon as a new phone comes out, so, the clock is ticking. Neal karlinsky, abc news, cupertino, california. When we come back here tonight, backlash on the tennis court, and while the worlds top female player is now speaking out, after what was said about female tennis players. Also, the new warning tonight about draw si Truck Drivers on the highway. And then, the Family Reunion here in cuba. The professional ball player, the relatives at the airport, ready to welcome him home. The detail on this surface book is amazing. With the tiger image, the saliva coming off and you got this turning. Thats why i need this kind of resolution and computing power. Being able to use a pen like this. On the screen directly with the image. It just gives me a different relationship to it. And i cant do that on my mac. To folks out there whose diabetic nerve pain. Shoots and burns its way into your day, i hear you. To everyone with this pain that makes ordinary tasks extraordinarily painful, i hear you. 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The university of Minnesota Study monitored more than 1,600 Truck Drivers diagnosed. The finding . Truckers who dont follow a trapper Treatment Program from a fivetimes higher rate of serious and preventable crashes. And a tearful homecoming right here in cuba for a cubanborn big leaguer. Tampa bay rays prospect day ron verona, who defected two years ago, reuniting with his family members here. The rays in havana to take on the Cuban National team tuesday. President obama and raul castro both expected to attend, and, of course, well be there, too. When we come back here tonight from cuba, the streets of havana are alive. The gold rush is on. Opportunity knocks, and the a tour of havana. T have access to basic banking, r at temenos, with the we can enable a banker to travel to the most remote locations with nothing but a phone and a tablet. P everywhere where there s a phone, you have a bank. Now a person is able to start a business, and employ somebody for the first time. 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To folks out there whose diabetic nerve pain. Shoots and burns its way into your day, i hear you. To everyone with this pain that makes ordinary tasks extraordinarily painful, i hear you. Make sure your doctor hears you too i hear you because i was there when my dad suffered with diabetic nerve pain. If you have diabetes and burning, shooting pain in your feet or hands, step on up and ask your doctor about diabetic nerve pain. Tell em cedric sent you. This local young womans life lost in a tragic fall. The timely message of hope her high school is sending to those lost in grief. Warmer weather is on the way. Im tracking rising temperatures and some gusty winds heading our way. Next on 9 on your side at 7. Finally tonight, from here in havana, we have returned to find the old American Vintage cars that drive through the streets of this city, but opportunity knocks, and the American Hotel chains that are already waiting. Heres abcs jim avila. Reporter as we drive around this city, captured in time, there are plenty of changes in havana, too. The biggest . A surge in american tourism. We wanted to be here before too many big changes happen. Reporter hotels are near capacity. Through airbnb and pocketing, in his case, 46 a night. Airbnb now offering more than 4,000 rental Properties Across the island. A windfall for people who average 20 a month. In this town, two and a half hours outside havana, today, airbnb going door to door, recruiting rooms for rent. Both marriott and starward getting approval just this week to run several landmark havana hotels. Its going to be a Luxury Collection and its going to happen hopefully sometime this year. Reporter u. S. Airlines competing to bring americans here. And wuchb of the new things is that you can go mobile and be mobile. The internet has come to havana. Its as slow as the cars, but its here. Jim avila, abc news, havana. Jim avila tonight. Jim, thank you. Athank you for watching here on a monday night. More of our coverage of president obamas historic trip here. The big name tomorrow, the tampa now at seven. Hearts are broken. As the tristate remembers a Kenton County woman who fell to her death at a nature sanctuary. What her former high school is doing tonight in her honor. More threats at tristate schools. And its taking a toll on students and teachers. Whats being lost in the classroom when children are put in fear. A locked door is all that stands between a clerk and two wouldbe robbers. But hear why grant county investigators think this isnt the first time theyve been shut out nine on your side at seven