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Sreenivasan the republican president ial race is effectively over, as of tonight, and the partys new leader is looking ahead. At the same time, detractors now face a decision how to reconcile with the new reality. John yang has our report. Reporter on his first day as the apparent republican nominee, donald trump said hes confident the party would fall in behind him but that some were welcome to leave. I dont think its imperative that the entire party come together. I dont want everybody. I dont even want certain people that were extraordinarily nasty. Let them go their own way. Reporter trump, who rails against politics as usual, said hes looking for a running mate with a political background to help him navigate washington. He spoke again, late today, on cnn. It took just a little more than 300 days for the outsider to demolish a field of 16 rivals, including current and former officeholders with more than a century of combined government experience. Late today the last opponent standing, Ohio Governor john kasich, made it official as i suspend my campaign today, i have renewed faith, deeper faith that the lord will show me the way forward and fulfill the purpose of my life. Reporter ted cruz quit last night after trump routed him in the indiana primary we gave it everything weve got but the voters chose another path. Reporter Party ChairmanReince Priebus said its time for the party to get behind trump and start working toward the november election. Weve got to unify, we need time to unify. And and we will unify. But this is what today starts, which is this unification process. Reporter but a parade of prominent republicans are heading for the exits. Their Voter Registration cards. Freshman senator freshman senator ben sasse of nebraska said he could never vote for trump, tweeting last night reporters keep asking if indiana changes anything for me. The answer is simple no. And onetime trump rival senator Lindsey Graham tweeted if we nominate trump we will get destroyed. And we will deserve it. Despite losing indiana, democratic frontrunner Hilary Clinton now claims 93 of the delegates needed to clinch her partys nomination. But Bernie Sanders made clear last night hes not going anywhere. I understand that secretary clinton thinks that this campaign is over. Ive got some bad news for her. applause reporter clinton, meanwhile, turned her attention to trump, as she did today on cnn ive seen the presidency up close from two different perspectives, and i think i know what it takes. And i dont think we can take a risk on a loose cannon like donald trump running our country. Reporter already launching a general Election Campaign, as she still works to secure her own nomination. ni for the pbs newshour, im john yang. Sreenivasan well explore the new lay of the land on both sides of the president ial race, after the news summary. Woodruff in the days other news, a wildfire burned its way into canadas main Oil Sands City and forced almost 90,000 people to flee. Everyone was ordered out of fort mcmurray, alberta, in the provinces largest evacuation ever. The fire has raged across tinderdry woodlands since sunday, and consumed entire suburbs. Many people headed south, others sheltered in nearby camps, and some criticized the way it was handled. Well, its a disaster, and i find that it is not fair, they didnt even let us take our things when we asked them, so we have lost everything now. Woodruff Prime MinisterJustin Trudeau said today the countrys military stands ready to help if needed. Sreenivasan from fire to water. President obama made a long awaited visit to flint, michigan today, where the Drinking Water has been contaminated with lead. William brangham has the story. Brangham the president was greeted by gray skies and a line of michigan officials including republican Governor Rick Snyder and flint mayor karen weaver. He urged parents in flint to have their kids tested for lead exposure and to use filters on their tap water. Then, he took a drink himself. Generally, i have not been doing stunts here, but. And this used a filter, the water is flint water that was filtered. Brangham this visit was prompted in part by a letter from mari copeny, an eightyear old girl in flint. I am one of the children that is affected by this water, and ive been doing my best to march in protest and to speak out for all the kids that live here in flint. Brangham known as little miss flint, she and other residents had the chance to meet with the president today. You should be angry, but channel that i thinker. You should be hurt but dont sink into despair. And most of all, do not somehow communicate to our children here in this city that theyre going to be saddled with problems for the rest of their lives, because they will not. Theyll do just fine. Brangham all of this comes two yearafter the citys water source was switched to the flint river, to save money. After months of complaints of tainted water, officials acknowledged the river water wasnt treated properly and had leached lead from old pipes into peoples water supply. The city has stopped using the river, and lead levels are gradually falling as the lead pipes build up a protective coating again. But questions persist about who knew what and when about the lead contamination. Julie mack is a reporter at michiganlive, a state newspaper consortium. She was part of an Investigative Team looking into emails and documents from Governor Snyder and his inner circle. There was something obviously seriously wrong with the water. People are coming to showing off jugs of brown water for a year. You know, 17 months before they did anything. And that remains a puzzle of why did it take so long for there to be action . booing good afternoon. Brangham snyder himself was heckled and booed today at his speech in flint, and he apologized again, saying, your government failed you. Looking ahead, the mayor of flint estimates itll cost 55 million to remove and replace flints old lead pipes. The Michigan Legislature has approved 67 million since october, but so far, its been slow to reach residents. A congressional package of 100 million for the water system, and 50 million for Health Care Needs associated with lead poisoning, is still awaiting action. For the pbs newshour, im William Brangham. Woodruff the u. S. Justice department warned North Carolina today not to enforce a new l. G. B. T. Law. The statute limits protections for gays, lesbians, bisexual and transgender people. The Justice Department said itni violates federal civil rights laws. The department notified republican governor pat mcrory that the state could lose hundreds of millions of dollars in federal funding. Sreenivasan the biggest automotive recall in u. S. History will get even bigger. Japans Takata Corporation is adding up to 40 million Additional Air bag inflators on top of nearly 30 million already recalled. In some cases, the devices can fire metal shards when they go off. But federal regulators acknowledged today that replacing all of them is a huge job. There is already concern about supply being available. Part of the issue here is to make sure we accelerate and as quickly as possible get the replacements, but we do not want to introduce new safety risks by pushing too fast too hard. Sreenivasan the takata airbags have been linked to at least 11 deaths. Woodruff in syria, the government and moderate rebel factions have agreed to restore a fragile ceasefire in aleppo, after days of fierce fighting. The u. S. And russia worked out the agreement, on the heals of similar deals in damascus and latakia province. The Syrian Military said later that the aleppo truce is good for only 48 hours. Sreenivasan the Global Tobacco industry was dealt a double blow today. The European Unions highest court upheld requirements that cigarettes be sold in plain packages covered mostly with Health Warnings. The rules also limit advertising for ecigarettes. Separately, Indias Supreme Court ordered that Health Warnings cover 85 of a cigarette packs surface. Woodruff back in this country, the federal Transportation Security Administration is moving to address long lines at the busiest u. S. Airports. Officials said today theyre adding more screeners and bomb sniffing dogs to expedite the screening process. Airlines have voiced concerns that growing wait times will affect the peak Summer Travel season. Sreenivasan and on wall street, stocks sagged after a private survey of job creation turned in disappointing numbers. The Dow Jones Industrial average lost 99 points to close at 17,651. The nasdaq fell 37 points, and the s p 500 slipped 12. Still to come on the newshour will the g. O. P. Finally rally around donald trump . We get takes from political reporters and former president ial candidate ben carson; the u. S. Role in fighting isis, under fire after a navy seal is killed in iraq; why half of all teenagers say theyre addicted to their phones, and much more. Woodruff on this day with woodruff on this day with more than its share of political tumult, the questions abound how exactly did donald trump upend the Republican Party to become its presumptive nominee for president . And how does Bernie Sanders decision to stay in the race affect Hillary Clinton . For some answers, we turn to susan page, Washington Bureau chief for usa today; and karen tumulty, National Political correspondent for the washington post. And welcome to both of you. So, i think its fair to say that a year ago, hardly anybody thought donald trump would have sewn up his partys nomination by now, susan, much less before Hillary Clinton sews up hers. How did he do it . You know, he didnt have the best campaign organization. He didnt have experienced people around him. He didnt have the best pollsters the best ad, he didnt spend the most money. He had a message. He understood the mood on the part of the american electorate that almost no one else did, how angry and frustrated and how much a desire of a different kind of politics that group of republicans in the primaries, the kind of politics they were ready to embrace. Woodruff karen, what would you add . I think not only did he have that. He had it early. The fact is, donald trump, six days after the 2012 election, filed the paperwork to trademark the phrase that would become the signature of his campaign which is make America Great again. He not only had a sense of the electorate, but he had it early, and he had it at a time when the Republican Party elders thought that thereue know, what they needed to be doing was sort of softening the edges of the party, you know, appealing to women and hispanics and young people. Donald trump sensed that what would win this primary race was exactly the opposite. Woodruff so here we are now, hes sewn it up. All day long, i think, weve been watching a parade of republicans, conservativesxd otr either saying never donald trump, theyre not going to go with him, susan, or some of them gradually falling in line. How serious opposition is is the opposition that he faces in his own party . I think the opposition is not serious in terms of getting the nomination. I think that battle is over, and he is now the face of the Republican Party. But you do see some fervent supporters, most of them not elected Senior Republicans in the electorate. You see a couple of people saying they wont vote for him. But you know the favorite lines of the republicans running for the senate this year, im going to summit the nominee without saying Donald Trumps name. This is a distinction that i think democratic ad makers, democratic opponents arent going to recognize. Its an effort to not break with the expaert yet not get too close to donald trump. While he succeeded in winning this nomination, he is at odds with the kind of coalition that we think you need to have to actually win the presidency. Woodruff karen, you actually interviewed donald trump last night as the results from indiana were coming in. What are the challenges that he faces now heading into this general election . Well, i think that the challenges are going to be presenting himself to an electorate that goes beyond the most fervent grassroots republicans. It is going to be transforming himself into something and somebody who the broader swath of the electorate can actually imagine in the oval office. The other thing and what he told me in the interview he has decided what he has to do is make Hillary Clinton unacceptable to them, and he plans to do, that he told me, not by focusing on her ideas and what she would do for the country, but rather her past, that he thinks that that is a lot of fertile territory. Woodruff and, susan, how does she counternr that . She said in an interview today on cnn, she views him as a loose cannon. She used that term expoafebr ovr again. What are we looking at . So were look at two candidates who are each going to spend their time talking about the how terrible the other one is, right. This is what i think you do in an election where both candidates have negative ratings of above 50 . Theres limits to how much they can persuade people that theatre optimistic candidate of the future they ought to embrace. But they need to make the case that the other guy is simply unacceptable. Donald trump talkin talking abot Hillary Clinton that way, Hillary Clinton describing donald trump as not an acceptable commander in chief. I think thats a particular theme were going to see her hit over and over again, and someone who doesnt have the temperament you need to be president. Woodruff meantime, karen, Hillary Clinton still faces a challenger in her own party, Bernie Sanders, as wenr know, wn the indiana primary. Hes likely or expected to win some of the primaries coming up between now and the convention. How much of how does that affect Hillary Clintons path from now until the convention in philadelphia in. You know, it probably doesnt affect her chances of winning the nomination. What it could affect and this ball is very much in Bernie Sanders court what it could affect is how enthusiastic Bernie Sanders supporters are about supporting her, about turning up and voting for her in the fall. And this is a choice as, you know, the Clinton Campaign has said, but its a real choice, as to, you know, what kind of tone he takes for the remainder of the primary, whether its talking about his ideas and how he wants to shape the democratic agenda or whether it is beating up on the most likely nominee. Woodruff how do you see that democratic contest, susan . Well, you know, i think its a constant reminder of some of Hillary Clintons weaknesses. To have Bernie Sanders not only out there running but beating her in primaries, as he did last night. And it prevents her from doing what we traditionally see candidates do which is move a little bit to the middle after securing their partys nomination. She is, i think, not awbl to do that. Shes been pulled a little bit to the left, tugged to left by him, particularly, say, on the another of trade. Its going to keep her there and thats a battle i think well see fought out over the platform when you come to the Democratic Convention in july. Woodruff meantime, karen, still, so much attention on donald trump and what he has been able to pull off and what he needs to do. From your conversation with him, what kind of sense did you get of how he sees his own challenge in the next months in the months to come . You know, he he sounded pretty happy with the kind of campaign he has run, and seems to believe that he can continue to do that. I think, however, that a general Election Campaign is going to requi