Bernie wouldnt be as much fun. Donald trump sets his sights on Hillary Clinton. Thats right, well fire hillary. Hillary, youre fired. Now clinton is talking togetherness, rolling like a nominee, and its contested convention or bust for anybody whos not trump. President obama speaking in saudi arabia where he met with leaders. Im confident that a year from now, we will be able to say that because of these actions, all of our nations are more peaceful. The longest drug tunnel ever found on the california mexico border. We seized over a ton of cocaine and three tons of marijuana. More rain is forecast for floodravaged houston this morning. There are still neighborhoods historic changes to the 20 bill. Abolitionist Harriet Tubman will replace Andrew Jackson. Yeah whoo Queen Elizabeth is turning 90. She will be celebrating all day and for the next couple of months. Happy birthday espn has fired baseball analyst Curt Schilling after he posted an insensitive message regarding transgender bathrooms. A softball game in virginia comes to a standstill when a dust devil blows through the field. Went through the roof and all that matters. We are turning the Empire State Building crimson, the red, s that signifies donald trump. New york turned a building blood red, as was prophecized. I like to imagine him rubbing what the hell is happening . Im winning, thats whats happening. Whoo this mornings eye opener is presented by toyota. Lets go places. Welcome to cbs this morning. Donald Trumps Campaign now sees a clear path to victory in the republican president ial race. A Campaign Memo obtained by the Washington Post predicts he will get more than the delegates needed to win on the first ballot at the gop convention. Trump is also shaking up his unconventional tactics and promising a more traditional approach. In an interview published yesterday, trump said his campaign is evolving and, quote, im not going to blow it. His top aides meet today with Party Officials at an important meeting of the Republican National committee. Major garrett is at the meeting site in hollywood, florida. Major, good morning. Reporter good morning. The Republican National committee and donald trump cant seem to make peace. The rnc chairman, reince priebus, called the gop frontrunner part of his obligation to telephone every primary winner, but during that conversation, the two could not reach a ceasefire over trumps persistent allegations against rnc rules being rigged against him or resolve their differences over whether trump would participate in any more president ial debates. I walk into the voting room and they gave me a thing. And i saw stiff, stiff, trump. Reporter in rallies donald trump drew big crowds and reverted to his nasty side when referring to top rival ted cruz. Ted cruz, lyin ted. Oh, he lies. Reporter that ended trumps flirtation with decorum. Senator cruz is just about mathematically eliminated. Reporter at his new york victory party. Trump knows his next big fight with cruz will come may 3rd in indiana where cruzs strategy to deny trump the nomination by winning most of the states 57 delegates will be tested. Im millions of votes ahead, millions. Its a rigged, crooked system thats designed so that the bosses can pick whoever they want. Reporter cruz conceded he cant win the delegates required to secure the nomination. He predicted future contests in south dakota, washington, oregon and montana will block trumps path. Im not going to reach 1237, and donald trump is not going to reach 1237. Reporter for cruz, the only option left is to fight trump for delegate loyalties in cleveland in july. What is clear today is that we are headed to a contested convention. Reporter trump advisers still predict an outright nomination victory and a general election showdown. Hillary, youre fired. If she ever gets the chance to run. I think shes being protected. Reporter trump said a campaign against clinton would include criticism of her email scandal and possibly criminal charges if he wins the white house. Well, you have a sixyear statute of limitations. Right. And certainly this falls within that period of time. Reporter trump senior advisers will make a presentation to rnc members about how trump can win the nomination. Cruz and john kasich made similar presentations. Trumps narrative will be the only one based on plausible mathematics as opposed to hunches, aspirations, and intentions. All right. Thank you major. Bernie sanders told supporters he can still win the democratic nomination, but the Associated Press says that Hillary Clinton can lose the rest of the primaries and still be the nominee. The Sanders Campaign says it raised 46 million in march, compared to clintons more than 29 million. Both candidates spent about as much as they took in, and sanders will have to keep spending with five primaries coming up on tuesday. 384 democratic delegates are at stake. Nearly half of them are in pennsylvania where the latest poll shows that Hillary Clinton leads Bernie Sanders by 13 points. President obama is making a personal appeal to middle east allies to step up the fight against isis. The president met this morning with gulf arab leaders at a Security Summit hosted by saudi arabia. Margaret brennan is in riyadh with why the president is facing skepticism. Margaret, good morning. Reporter good morning. Well, saudi leaders say theyre confused by president obamas mideast policy, urging them to share the neighborhood with iran, their longtime enemy, and a country that both consider to be a state sponsor of terrorism. Smiles for the cameras disguised an otherwise tense summit with gulf leaders. Todays meetings focused on how to counter an explosion of mideast violence that they believe is being fueled by longtime foe iran. Its always a pleasure to be here. Reporter the u. S. Brokered nuclear deal has also made rulers here deeply suspicious of president obamas intention. Saudi leaders in particular feel he has jeopardized their status as americas key ally in the middle east. President obama tried to reassure the members of the gulf cooperation council, or gcc. Given the ongoing threats in the region, the United States will continue to increase our Security Cooperation with our gcc partners including helping them improve their own capacity to defend themselves. Reporter president obamas arrival on wednesday was not met with the usual pomp and ceremony given to visiting leaders. It also wasnt broadcast on state tv. But u. S. Officials denied that was a snub. And in a twohourlong meeting yesterday, president obama tried to clear the air with king salman. But frustrated saudi leaders are already looking towards the next u. S. President , whether its Hillary Clinton or even donald trump. Now, despite all of this frustration, both saudi and american officials tell me that they need each other, and they are determined, charlie, to maintain this Strategic Military alliance. Thanks, margaret. Margaret brennan in saudi arabia. Before the president returns from his overseas trip, i will go to europe and interview him next week in germany. You can see that conversation tuesday here on cbs this morning. And more tuesday night on my pbs program. Looking forward to that. Southeastern texas this morning is bracing for more thunderstorms. The houston area is struggling to recover from days of historic rains that killed eight people. A Traffic Camera captured dramatic video of one driver who got trapped in the rising water. Manuel bojorcas is in houston. Manuel, good morning. Reporter good morning. The floodwaters here in houston are slowly starting to recede, but there is simply so much that places like this apartment complex remain flooded. With vehicles submerged. And there are dozens more vehicles in the distance behind me also ruined. The rain has been on and off here for the past four days. Further complicating the citys rescue and recovery efforts. After another round of soaking rains, streets still look like waterways. And many homes in the houston metro area are still under water. Im all the way down here on the lefthand side. Reporter mike moore wanted to help. So he rented a canoe and has been paddling his neighbors in and out for supplies. Why do you feel compelled to do it, to help out . Its community. I mean, you know, the people here are suffering. Everybodys losing cars, jobs, livelihood. You just want to help. Reporter some are already trying to pick up the pieces. Steven cobbs home was ravaged by floodwaters. The people helping him, complete strangers. Cobb is thankful. I wouldnt be able to do it. All this can be replaced, but we live in the greatest community, the greatest city. Reporter the city of houston is trying to prevent future tragedies. This new video shows the moments after claudia drove her suv around a roadblock and into the deep floodwaters. The 25yearold drowned in her car before a toll worker could reach her. Weve got to identify every location like that, and weve got to put in place a barrier system that prevents people from driving in. Reporter although thunderstorms are in the forecast throughout the day, the system that dumped this record rainfall here is now past us with the city now looking towards the weekend to dry out. All right, thank you, manuel. The damage from last weeks hailstorm in texas is being called the most expensive in the states history. Baseballsized hail shattered the car windows and pummeled homes. And Insurance Group estimates the cost of the destruction at nearly 1. 4 billion. The United States is reportedly reached an agreement with volkswagen over the automakers rigging of diesel tests. The company acknowledged last year it installed software in cars that misled customers about emissions. A german newspaper reports the agreement calls for each affected vw owner in the United States to receive 5,000. Customers reportedly can also have their cars updated for free to comply with emissions regulations. Michigan governor rick snider called the first criminal charges in the flint water crisis deeply troubling. Two state regulators pleaded not guilty to misconduct, evidence tampering and violating Water Treatment laws. A flint City Employee is also charged. They failed in their responsibilities to protect the health and safety of families of flint. They failed michigan families. Indeed, they failed us all. I dont care where you live. Michigans attorney general also warns that this is only the beginning of the investigation. He says no one including the governor has been ruled out for possible prosecution. Police in southernedly say are no obvious signs of foul star in wwe star chynna. She emerged in the 1990s to become one of the bestknown and most popular female professional wrestlers in history. She often competed against the men. At one point she was a wwe womens champion. After retiring from wrestling, she appeared in reality tv shows including celebrity rehab. She was 46. Federal investigators in Southern California say they found what could be the longest crossborder drug tunnel. They announced wednesday that the tunnel discovery led to a massive drug bust. The tunnel apparently stretches the length of more than eight football fields from tijuana in mexico to san diego. Carter evans shows us how agencies nearly 30 million worth of drugs. Reporter barely wide enough to squeeze a person through, this unassuming hole transforms into an elaborate underground maze. Clear. Reporter zigzagging for half a mile, the cramped, compact tunnel stretches across the u. S. mexico border. And investigators say its an unprecedented drugsmuggling system. We believe this to be the longest tunnel that weve discovered in the district to date. Reporter as part of an eightmonth investigation, federal agents seized more than one ton of cocaine and seven tons of marijuana worth nearly 30 million. The tunnel stretched from tijuana all the way to this Industrial Park in san diego where the drugs were loaded. Only about three feet wide, the tunnel was remarkably complex. Ten feet down in this hole, its really a completely different story. It is equipped with a ventilation system and a commercial large elevator that i would estimate could hold eight to ten people. Reporter investigators say this is the largest single seizure of cocaine related to a tunnel along the california mexico border. Most of the cocaine smuggled into the u. S. Comes in on small boats and even makeshift submarines. We saw this firsthand when we traveled with the coast guard last year following a record 200 million drug bust in the pacific. So far six people including one u. S. Citizen have been arrested in connection with this latest seizure, and they face Drug Trafficking charges. For cbs this morning, carter evans. A teachers aide in milwaukee is under arrest this morning after video shows him manhandling a student. The video taken yesterday shows him pushing the 14yearold student to the floor. The student was treated for minor injuries. Another student in the class told our milwaukee affiliate, thats wdjttv, that the two were arguing before the attack. The Supreme Court is considering laws this morning that make refusing an alcohol test illegal. The eight justices heard oral arguments yesterday. Its a crime in several states to refuse a breathalyzer or blood test. Jan crawford is outside the Supreme Court to show us why some believe police should get a warrant first. Jan, good morning. Reporter good morning. So you know, the fourth amendment, it generally says that the government cant search you or your house without a warrant unless you give consent. But it can suspend your license if you refuse a breathalyzer or a bloodalcohol test. And in some states, that refusal can send you to jail. Police across the country have relied on blood and breathalyzer tests to fight drunk driving. But in 14 states, police can perform these tests without a warrant. And in some of those states drivers who refuse could find themselves behind bars. Drivers in minnesota and north dakota filed the three cases under review after they were pulled over for suspicion of drunk driving. The search warrant is required in every case. Youre going to take more Police Officers off the streets. Reporter kathy keena is a government lawyer fighting against requiring warrants. In those smaller jurisdictions where there are only one or two officers and youre requiring them now to get a warrant in every situation, not only is the Public Safety on the road going to be affected, but just Public Safety in general. Reporter during the 70minute debate, some justices seemed to side with the states regarding breath tests. Justice Stephen Breyer said what is wrong with a breathalyzer test when it can save lots of lives and is given to those people where there is probable cause. But others question whether police could order a test without a warrant. Justice anthony kennedy, youre asking for us to make it a crime to exercise what many people think of as a constitutional right. Justice Sonia Sotomayor called these laws a very drastic change, asking do we dispense with a very important requirement in our law, that before you search particularly the inside of a person with a needle or in an intrusive way that you get a warrant . Now, critics of this law say this is pure government overreach and that police could easily get a warrant when theyre transporting a drunkdriving suspect to the hospital where they do those blood tests. A decision in this case and others is expected by june. Gayle . Queen elizabeth ii is brita britains first monarch to turn 90. Boom is right. A gun salute in londons hyde park this morning marked the queens birthday beginning a series of celebrations there. Mark phillips is at Windsor Castle, thats west of london, where the queen, another boom, is greeting well wishers. Mark, be careful and good morning reporter good morning, gayle. Well, not too many 9yearolds get to celebrate their birthdays by taking a walk among a crowd of several thousand complete strangers. But when youre the queen, its part of the job. Normally this birthday which is her real birthday is an official state event celebrated in june. Normally this one is a private affair. Just with family and friends. But 90 is special, it is last time she did this was on her 80th. And this is part of three days of public celebration of this event. Later today, she will light a big beacon bonfire here at Windsor Castle to be matched by similar bonfires and beacons across the country. There will be a family dinner this evening which the princes say theyre going to try to keep their grandmother up late. Thats not likely to interfere with another event tomorrow, a lunch with president obama at which he will likely convey the birthday greetings of the former colonies. Nora . Aww. Mark phillips at Windsor Castle. Thats so great at 90 that you can take a walk. Absolutely. And shes always got her purse. You never wonder whats in the queens purse . She looks kind of like my mother. Does she . Yes. She looks great. How many generations will we see there . I know. Theres those pictures out with her grandkids are just darling. Absolutely darling. All right. You could soon ditch your cable box and still get all your favorite channels. Ahead, how one cable giant is beginning to transform the way its customers watch tv. , ahead, why they think somebody is after her. The news is back after this right here on cbs this morning. After 51 days of the pursuit of four bandits who chose a prius as their getaway car, a new development prius owners from all over ame