Right now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. Im Savannah Guthrie in for lester. Hillary clinton minced no words and took no prisoners today in a speech built as a major Foreign Policy address she dropped the hammer on donald trump sometimes mocking, sometimes pummelling the nominee for position she says endangers the country, frighten allies and embolden enemies. Clinton still faces a democratic primary opponent with diehard supporters not ready to give up and a razor tight primary race in california but tonight in san diego, she had her eye on the general election and her sights trained on trump. Nbcs Andrea Mitchell was there. Andrea, good evening. Reporter good evening, savannah. Hillary clinton unleashing h on Donald Trumps qualifications to be commander in chief and she didnt hold anything back. It was a 33minute takedown of donald trump. Donald trumps ideas arent just different, they are dangerously incoherent. They arent even really ideas, just a series of bizarre rants, personal skews and outright lies. [ cheers ] reporter Hillary Clinton blasting trump as tempermentally unfit to hold office. This isnt someone that should ever have the nuclear code because its not hard to imagine donald trump leading us into a war just because somebody got under his very thin skin. Reporter the speech a point by point rebuttal of trumps proposal. On Nuclear Weapons where trump suggested letting japan, south korea and saudi arabi about nuclear war. Reporter on trumps temporary muslim ban and the wall with mexico. Remember, that plenty of muslims and immigrants serve and fight in our armed forces. Reporter and even predicting how trump would react to her speech. Bragging, mocking, composing nasty tweets. Im willing to bet hes writing a few right now. [ laughter ] reporter in fact, he was. Tweeting bad performance by crooked Hillary Clinton. Reading poorly from the teleprompter she doesnt look president ial. Its the case against trump Many Democrats have been pressuring clinton to make with polls showing a tight race nationally. Dont let anyone tell you america isnt great. Donald trump has america all wrong. Reporter clintons Foreign Policy experience once considered her calling card against trump but one recent poll showing voters are nearly split. Clinton barely beating trump on who would make the country more libya and her iraq vote and now shes trying to say you know what . Donald trump is not fit to be in charge of our nuclear arsenal. Reporter clinton hoping she made that case today. There is no risk of people losing their lives if you blow up a golf course deal, but it doesnt work like that in world affairs. Shes talking to people who havent been convinced by donald trump, but who have their own doubts about Hillary Clinton. Reporter a speech aimed as much at republicans and independents as democrats. Andrea mitchell, nbc news, san diego. Im Hallie Jackson in san jose. Overshadowed by todays Foreign Policy fight, House Speaker paul ryan finally endorsing donald trump tweeting hell vote for trump and telling the a. P. I just wanted to have a good Comfort Level that these policies, these principles and policies are something we would be able to work with him on. Reporter the backing from congress highest ranking republican comes 29 days after trump became the nominee and 22 days after the pair first met on capitol hill a circus then, for some a celebration now. The two teams have been able to get together and talk about where each person stood on the commitment to policy agendas that make us republicans. Reporter while policy divisions remain over trade, entitlement reforms, trumps proposed temporary muslim ban, ryan today writes its no secret he and i have differences adding we have more Common Ground than disagreement. Why does ryans support matter . Its a signal for the rest of the party to get behind the billionaire businessman, yet highprofiles remain. The bush family, several key senators and governors. Its an important day to not have the speaker of the house in opposition of the nominee, that would be unprecedented. Reporter ahead of his rally in san jose, trump is tweeting its so great to have ryans endorsement. A top source close to the speaker says he too soon to say if ryan will campaign with trump or raise money with him. Savannah . Hallie jackson, thank you. For more lets bring in chuck todd, moderator of meet the press. Chuck, two big events today. Clinton takes off the gloves with trump as weve yet to see and trump gets the prized endorsement of the House Speaker. Well, look, lets start with Hillary Clinton. I think as a performance, as a candidate, you could argue that this was the single best performance shes had as a candidate this cycle. She delivered that speech very well, but it was not a Foreign Policy speech. This was a trump takedown speech under the umbrella of International Affairs but clear it was about trump and temperament and what a break for Hillary Clinton. Any other opponent and her Foreign Policy speech would have been a lot more defensive. She would have had to defend libya and iraq vote and things like that. Thanks to trump she didnt have to do that. For paul ryan, this is the leader when youre speaker of the house, he really had [000 06 58;00] it is a tepid endorsement but important the biggest reason its important right now, its financial. There were some donors still sitting on the sidelines because of ryan, savannah. Chuck todd in washington for us, thank you. There is a tragic breaking story out of texas tonight where an all out search is underway after a military vehicle carrying numerous soldiers was caught in high flood waters near fort hood and after days of disaster, even more heavy rain is moving in tonight. Lets go to Gabe Gutierrez in texas for us. Gabe, good evening. Savannah, good evening. Yes, breaking news out of fort hood where officials are confirming three soldiers are dead, three others are hospitalized in stable condition and an all out search is on for six other soldiers who are unaccounted for at this hour. There is an active search and rescue operation underway. This comes after a devastating few days for texas. The deluge lasted for days and the governor has declared 31 counties states of disaster. Here in Fort Bend County there are 150 highwater rescues. The brazos record crested at 55 feet. There is a threat in the weekend and several inches of more rain. But again, the breaking news out of fort hood, three are dead and three others hospitalized in stable condition and the search is on for six more who are missing at this hour. Savannah . Gabe gutierrez, thank you. Another awful tragedy for the military today after a pair of terrifying incidents in the sky. Two jets flown by elite pilots with a crash landing in two separate states. One a thunderbird that had just flown over a graduation attended by president obama. The pilot managed to eject to safety and the other, a blue angel erupting in a fire ball and killing that pilot. [000 08 59;00] thunderbirds had just soared over the u. S. Air force academys graduation. President obama among the digniatires watching as cadets tossed their caps but then one of the six jets goes down dropping out of the Clear Blue Sky in colorado springs. Numerous callers reporting aircraft is down. Pilot ejected. Reporter the highlytrained pilot in the f16 fighting falcon like this one safely ejecting. His plane appearing largely in tact. Spotted in an open field, no serious injuries. Before heading back to air force 1, the president stopped to meet with the pilot thanking him for his service and First Responders for rushing to the scene. Weve got a fire ball at the rec park. Its on the golf course. Reporter today another crash, a fire ball in tennessee. A blue angels jet going down during a practice run. The navy plane an fa18 hornet crashed near a golf course in smyrna. The elite highly experienced squad like this one was prepping for an air show this weekend. Tonight, the Navy Confirms no parachute deployed. The pilot feared dead. Two military planes going down in the same day as authorities began their investigation. Miguel almaguer, nbc news. There are stunning new twists tonight in the deadly shooting of a professor on the ucla campus. Police now believe the shooter also murdered a woman he was once married to halfway across the country. And found in his home a quote kill list according to police with the name of yet another professor shaken but alive tonight. Nbcs gadi schwartz. Reporter it was all hands on deck over 500 police, more than 60,000 students and staff. There is a shootout going on if you guys can hear that. Reporter frantic parents trying to reach their children. I dont know whats [000 10 58;00] reporter today Police Identified the shooter, two guns, loads of ammo and tactical gear. Lapds chief say s it could have been a lot worse. He was certainly prepared to engage multiple victims. Reporter Police Believe the shooter, former phd student Mainak Sarkar came on campus to kill Professor William klug Police Looking into a blog that appeared to be posted by sarkar saying the professor stole a computer code writing your enemy is your enemy but your friend can do a lot more harm. Lapd chief charlie beck saying ucla dismissed the claims. This was a making of his own imagination. Reporter at the ucla campus shooting scene a cryptic note sarkar mentioning his cat in minnesota leading investigators to his home in st. Paul. There they found whats described as a kill list with a name of a woman, klug and another professor that woman once married to sarkar found murdered in her deceased prior to the ucla shooting. Reporter the other ucla professor arrive and terrified now speaking with police. A source who knew sarkar and klug tell nbc news he came across as unstable but they did not think him dangerous. Police asking for the publics help to find sarkars car as the campus tries to recover before finals, students returning to some of the same classrooms they barricaded to keep themselves safe. Gadi schwartz, nbc news los angeles. Tonight, confirmation from the medical examiner of what many had suspected since he was found unresponsive in his home back in april. Prince died from an overdose of a powerful painkiller called fentanyl 100 times more powerful than morphine. And the feds say its killing hundreds of americans. Nbcs Stephanie Gosk has the details. Reporter what had been the fear for weeks appears to be true. Music le p 57. At the time of his death, the music legend weighed merely 112 pounds. The medical examiner found high levels of fentanyl in princes blood stream official recalling his drug an accident. Fentanyl is 100 times fentanyl is a synthetic opioid 100 time s more potent than morphine typically prescribed in the hospital for pain. Its a time bomb. Patients are playing with death if they are using it out of the hospital settling. Reporter it has ing. Reporter it has become increasingly available illegally in the streets. Hundreds overdose fatally annually. In the days leading up to his death, there were signs prince was struggling with an addiction. Unresponsive passenger. Reporter the pop stars plane made an Emergency Landing in illinois for unspecified medical reasons and the day before he died, a close associate called addiction specialist dr. Howard kornfeld in california for help according to the doctors attorney but dr. Kornfeld never directly treated prince. A search warrant said he was getting care locally from dr. Schulenberg. A source with knowledge of the treatment says the doctor never prescribed opioids. The question now becomes will there be criminal charges . Where did the fentyn fentyanol come from and was there any criminal negligence . Savannah . A lot of questions, Stephanie Gosk, thank you. There is word boxing legend muhammad ali is hospitalized with a respiratory issue. The 74 ali who suffers from parkinsons disease is in fair condition now and expected to stay in the hospital for only a brief time. Still ahead tonight, Summer Travel is heating up and were on the front lines as the battle at theme parks to protect from the zika virus and the rush to move priceless works of art at the museums as the flood waters rise. People, and partners to help companies be. Local global. Open secure. Because no one knows like at t. Im terrible at golf. He is. But id like to keep being terrible at golf for as long as i can. New patented ensure enlive has hmb plus 20 grams of protein to help rebuild muscle. For the strength and energy to do what you love. New ensure enlive. Your Insurance Company wont replace the full value of your totaled new car. The guy says, you picked the wrong insurance plan. No, i picked the wrong Insurance Company. With new car replacement, well replace the full value of your car plus depreciation. Liberty mutual insurance. [ guitar playing ] ugh. Heartburn. Sorry maam. No burning here. Try new alkaseltzer heartburn relief gummies. They work fast and dont taste chalky. Mmmm. Incredible. Looks tasty. You dont have heartburn. New alkaseltzer heartburn relief gummies. Enjoy the relief. The Summer Travel season is upon us but this year the zika virus is adding fears at popular destinations, especially florida with the theme parks. Of the nearly 600 cases of zika in the u. S. , about onethird are in florida. Kerry sanders is at ground zero in the fight to protect american tourists this season. Reporter few is thats already underway here. Im going to put this over here on the edge of the trees. Reporter Mosquito Control mostly out of sight. This should be a good spot. Reporter on and off theme park properties. At the fun spot theme park in orlando today, amisha lee eight months pregnant. The worry is here. Im concerned for the child and myself. Reporter shes taking precautions but florida officials are asking for more federal funds and soon. Its no different than having a hurricane. They are part of a national disaster, what this could be if we dont get ahead of it. Reporter on the front lines, terry torrez. Her team of four plus six parttimers fights the mosquito war on 1500 square miles that borders disneyworld. Shes worried that not enough manpower for the zika threat. That federal money is absolutely needed. Reporter killing the mosquitos now is critical Say Health Officials because the mosquitos here in florida dont have zika but theyre likely to get it by biting a tourists that has the tourist and that mosquito can transmit it to an unsuspected pregnant woman. Visitors in florida strongly encouraged go on the defensive. Come prepared like any theme park day. Water, sunscreen and insect repellant. Reporter the state expects a Record Number of tourists this summer from all over the world. Kerry sanders, nbc news, florida. Were back in a moment with a visitor making time fly at a rare clock museum. Clock museu. 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I really notice a difference. And at two weeks superior sensitivity relief to sensodyne like the two steps step 1 cleans and relieves sensitivity, step 2 whitens. Its the whole package. No ones done this. Crest healthy, beautiful smiles for life. Tighter Safety Measures are being put into place at the cincinnati zoo after that 3yearold little boy fell in the gorilla enclosure. A new barrier like this will be uen the exhibit opens next week. Zoo keepers killed an endangered gorilla to save that child. This week police examined the actions of the boys family. They turned those findings over to prosecutors now. Overseas, days of near nonstop rain triggered historic deadly flooding across europe. Thousands forced to evacuate in germany and france and unbelievable scenes of waterlogged paris where people are trapped in their homes cut off as roads turn into rivers. The situation is now so dire the louvve will shut down tomorrow to allow Museum Officials to evacuate priceless art at risk of being damaged. Tonight, proof that time really can fly. A camera at a Pennsylvania Museum caught a visitor fiddling with a rare clock when, yes, it came flying off the wall in pieces. After a halfhearted attempt to hang it back up, the man decided it was half past time to get out of there. The museum released the video as a reminder to al when we come back, the perfect summer road trip destination. A cathedral of sorts to one of americas favorite culinary curiosities. But its hard to keep up with it. Your body and your diabetes change over time. Your treatment plan may too. Know your options. Oncedaily toujeo® is a longacting insulin from the makers of lantus®. It releases slowly to provide consistent insulin levels for a full 24 hours. Toujeo® also provides proven full 24hour blood sugar control and significant a1c reduction. 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To avoid longterm injury, seek immediate medical help for an erection lasting more than four hours. Stop taking viagra and call your doctor right away if you experience a sudden decrease or loss in vision or hearing. Ask your doctor about viagra single packs. Tonight, paying omage to an american original. For better or worse, spam has been for us for some eight decades. Kevin tibbles on the museum that celebrates things all pink and process. Reporter paris may have the louvve and the museum that celebrates all pink and processed. Reporter austin, minnesota has the mona lisa of lunch meat. Spamtastic. Reporter the spam museum is a slice of america. The delight made right here in austin for nearly 80 years has fueled everyone from our troops fighting overseas to our families around the dinner table. Cold or hot, smalpam hits the spot. When i eat it, it reminds me of home. Spam is part of america. Spam is simple ingredients, pork, salt, sodium nitrate. Reporter its up to you what you do with it. Spom spam orient l bites spam bites, spam cheesecake. Its sold in more than 40 countries. Were spamming the globe is what we like to say here in austin, minnesota. Reporter british funny guys immortalize the stuff. All this talk of spam has made us a tad peckish. Sam fries and a spam burger. Reporter so its across the street for a bite of deep fried spam. Its a spamful. Reporter back at the museum, samples to the faithfully. Proof this spam is no flash in the pan. Kevin tibbles, nbc news, austin, minnesota. And that will do it for us on this thursday night. Im Savannah Guthrie in for lester. Ill see you tomorrow morning for the today show. For all of us at nbc news, thank you for watching and have a for all of us at nbc news, thank you for watching and have a great night