Tonight, who really needs them. Nightly news begins right now. Announcer from nbc news World Headquarters in new york, this is nbc nightly news with lester holt. Good evening. We begin tonight with new chaos and arrests on the campaign trail. Police in riot gear confronting protesters, at times violent at a donald trump rally in anaheim, california. Demonstrators marching through the streets. It comes a day after some of the most chaotic scenes at a trump rally weve seen in albuquerque where protesters smashed through barriers, jumping on cars, again, police in riot gear moving in to quell the violence. We get the very latest now from nbcs katy tur. Reporter tactical teams on the streets of anaheim. Steps from the happiest place on earth. Inside only a handful of disruptions, among get them out of here reporter local authorities here not taking any chances. After protests turned violent in albuquerque last night. Tear gas, flames and anger. Donald trump cannot come to our city after calling us rapists. Lies. Reporter the candidate dismissing tuesdays protesters as thugs who were flying the mexican flag, and trashing the highest republican latino, new mexico governor for saying she was too busy to attend his rally. The governor has got to do a better job. Shes not doing the job. Hey maybe ill run for governor of new mexico ill get this place going. Reporter martinez, the chair of the republican governors association, another trump holdout, said in a statement she wont be bullied by him. Where trump goes, unrest follows. Chicago, pittsburgh, kansas city, eugene, dayton. A new wall street journal poll finding National Political support is split. Trump taking rural white communities, while clinton gets the larger more diverse cities. Every day, theres something again that makes me shake my head saying why in the world would i support trump. Reporter House Speaker paul ryan and donald trump will have a phone conversation tonight. Meanwhile, hundreds of protesters were lining this street just a few minutes ago. Now, only a couple dozen stragglers remain. Anaheim Police Holding the line. Lester, this is the same scene that we are seeing play out in city after city across america. All right, katy, thank you. An independent government report is breathing new life into the controversy that just wont go away for Hillary Clinton. A harsh rebuke from the state departments Inspector Office over clinton use of a personal email server for official business when she was secretary of state. It comes at a critical time in her race for president. Nbcs Andrea Mitchell now with late details. Reporter today Hillary Clinton dogged by her email controversy. An investigation from the state department, blasting clinton for using only a private home email server while secretary of state. And finding she violated the federal records act by not turning over all official emails before she left office. Concluding, sending emails from a personal account to other employees is not an appropriate method of preserving emails. Despite her previous claim. This was fully above board. People knew i was using personal email. I sent emails that i thought were work related to peoples dot gov accounts. Reporter clinton knew as early as 2010 her emails were not all safe for the she was asked, should she get an official state Department Email address or release her private address to the department . Clinton responded, lets get separate address or device, but i dont want any risk of the personal being accessible. The report found no evidence clinton requested or obtained permission to use a private server, and would not have been granted it if shed asked. Clinton refused to be interviewed by investigators, saying she wanted to talk to the fbi first. We quite fairly, i think, made the decision that we were going to await the opportunity to answer questions from the justice department. Reporter but already donald trump firing away. Shes as crooked as they come. Inspector generals report, not good. You have the state department saying Hillary Clinton exercised bad judgment. She shouldnt have done it. And thats going to be a republican talking point now all the way through election day. Reporter the report also says former secretary of state colin powell did retain his personal emails. But the rules were tightened under clinton years later. Longstanding cybersecurity failures. Lester . Andrea mitchell tonight, thank you. Lets turn to the latest in the long tsa lines at airports weve been seeing nationwide. Just as the Summer Vacation season sets to kick off this weekend. The man who runs the tsa today said the agency is making progress in cutting the wait times at many airports, but theres still 4,000 to 5,000 screeners short. We learned today on hundreds of occasions, tsa officers have been pulled from airports to work political events. Heres nbcs tom costello. Reporter one big reason the tsa is in trouble, the numbers just dont add up. In 2011, there were 45,000 screening officers at the nations airports. Five years later, 2,500 fewer are on the job. With 100 million more passengers flooding the system. Thats what the checkpoint backup stretching one, two, en three hours. Tens of thousands of passengers missing their flights. This summer which we are aggressively meeting headon. Reporter the tsa chief on the capitol hill hot seat today. What i think most of the American People view as a historic critical failure. Reporter today another stunning number. 250 times screening officers have been pulled from their airport duties to help screen people attending major events, sporting events, even political rallies. Where is the priority of supporting these events that have nothing to do with your core mission . We have 75 people on standby to assist with president ial security events over the course of the summer. Reporter he wants the officers back on the job at the nations airports. The tsa said it managed to cut to 20 minutes the lines at chicago ohare that stretched two hours last week. Part of the national strategy, hiring more screeners and converting parttimers to fulltime. In atlanta today, a trial run for a new tsa checkpoint. Fully automated with each bin full of passenger carryons, getting assigned an recycled through the system once empty. What the tsa hopes could help speed checkpoints along. Were looking at a lot of Lessons Learned and operations ovaserseo incorporate some of the things that are happening here in the united states. Reporter American Airlines representatives will testify before Congress Tomorrow that they believe so far this year, lester, 70,000 of their passengers alone have missed their flights. Tens of thousands, in fact 40,000 bags missing their connections, all because of this tsa mess. Back to you. As you remind us, the flying season is about to heat up. Tom, thank you. As is often the case, it is the most visible who get the blame. In this case the blueshirted tsa screeners who man those checkpoints. Its by accounts a difficult and thankless job. Today a veteran former screener opens up about the pressure of screening so many passengers a day, and hoping you dont miss something. She spoke with Nbc News National Correspondent miguel almaguer. Baggage screener at l. A. X. When i was there, morale was pretty low. Reporter Cassandra Calloway worked for the tsa for ten years. It can be very stressful. Theres a lot of pressure to keep the line moving. Reporter calloway, who said she resigned in 2013, after a personal dispute with a coworker, took her job after 9 11. It was a way to give back. To our country after what happened. It was just a way to show our country love. So whats to blame for the problem were seeing now . The blame goes everywhere. To me, on the agency, and also on the passengers. Reporter calloway said most of the 42,000 tsa officers who start at 15 an hour are well trained. Theres a little bit of difference between classroom training and real world training. Often say its unprepared passengers who slow unforgiving lines. How difficult can passengers be . Very difficult. Scream, yell at you, racial slurs. But the one thing that i hear from a lot of passengers when i worked there was that, im not going to fly unless youre here. Reporter a look from the other side. Those tasked with keeping nearly 2 million passengers safe every day. Miguel almaguer, nbc news, los angeles. There will be much more on the tsas troubles when Peter Nefenger appears on tomorrow morning on today. A new extreme Weather Threat is brewing for millions tonight after deadly storms sliced through five states yesterday, unleashing hail, floods, and more than 30 tornadoes. Nbcs Gabe Gutierrez has more from oklahoma where many are left picking up the pieces tonight. Reporter the powerful tornadoes tore through the heartland. Yanking a home off its foundation near dodge city, kansas. Just moments later, another twister forming nearby. Some drivers cut off by swirling debris. 30 reported tornadoes across five states. Obviously took a direct hit reporter in bristol, oklahoma today, beth roberts and her family are stunned. If you had waited a few more minutes we would have been sucked out that window. Reporter she rushed into her cellar with only moments to spare. The last few weeks in the state have been devastating, but the number of reported tornadoes this year is actually below normal. Over the last decade, the u. S. Has averaged more than 700 twisters by this point. This year, just 539. In arkansas, flooding almost killed a 13yearold boy who was sucked into a drainage pipe. Incredibly, First Responders rescued him with only minor injuries. Its a miracl reporter tonight kansas and texas could see more severe weather. Theres a slight risk of strong storms tonight in kansas and texas. But tomorrow, were going to start off with very windy storms through parts of missouri. As we go into the afternoon, were likely going to see strong storms through the Central Plains with large hail, damaging winds and tornadoes likely. Reporter but for now, beth roberts is just grateful to be alive. If we had stopped for one thing, you know, if we had done one thing differently, we might not be here. Reporter the severe storms are blamed for one death near oklahoma city. In this neighborhood, six homes were shredded. On this property alone, more than two dozen rescue animals were lost. Tonight there are new tornado watches in effect for parts of kansas and oklahoma. Lester . Gabe gutierrez tonight, thank you. A massive power outage this afternoon in seattle, knocking out traffic lights and leaving half the city paralyzed. It caused significant delays, as you can imagine, on the rails the Fire Department also got several emergency calls about people suddenly trapped in elevators. Crews said an equipment failure at a substation was to blame. But they were able to get things back up and running. President obama made a rare public apology during his visit to japan. After that nations leader in a highly unusual moment dressed him down on camera over a murder thats been linked to an american from the u. S. Military base in okinawa. Nbcs ron allen is in japan with more on the death overshadowing the president s visit. Reporter anger aimed at americas massive military bases in okinawa, japan. After the body of a 20yearold woman missing for weeks was found raped and murdered in the wooded mountains not far away. Tonight japans Prime Minister scolded president obama, and then said his entire nation is in shock. I feel profound resentment against a selfcentered and absolutely despicable crime, he said. Inexcusable. Reporter in custody, a 32yearold, former marine, now a worker at a base. Reigniting deep antiamerican sentiment. Okinawa home to nearly half of the 50,000 u. S. Troops here. Now, with local leaders calling for the complete withdrawal of u. S. Forces, the commander in chief vowed to do everything to make sure justice is served. Its all overshadowing mr. Obamas plan for a historic trip to hiroshima, the first u. S. President to visit since america devastated the city with an atomic bomb. Ron allen, nbc news, japan. Back at home, a major challenge to the white house in the battle over which bathrooms transgender people may use. 11 states are suing the Obama Administration over its sweeping directive requiring all Public Schools to let students use whichever bathroom matches their gender identity. The lawsuit criticizes the policy calling it, quote, a massive social experiment. Theres a lot more to tell you about tonight. Street tests, millions get them every year, but now some experts say theyre accurate only half the time and may actually make your stress worse. How to tell whether you really need one. Also, life after the white house. The pricey new digs purported to be the first familys next home. I had a lot of doubts goi. I was smoker. Hands down, it was, thats who i was. After one week of chantix, i knew i could quit. Along with support, Chantix Varenicline is proven to help people quit smoking. Chantix definitely helped reduce my urge to smoke. Some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. Some had seizures while taking chantix. If you have any of these, stop chantix and call your doctor right away. Tell your doctor about any history of Mental Health problems, which could get worse or of seizures. Dont take chantix if youve had a serious allergic or skin reaction to it. If you have these, stop chantix and call your doctor right away as some can be lifethreatening. Tell your doctor if you have heart or blood vessel problems, get medical help right away if you have symptoms of a heart attack or stroke. Decrease alcohol use while taking chantix. Use caution when driving or operating machinery. Most common sideaffect is nausea. Life as a nonsmoker is a whole lot of fun. Ask your doctor if chantix is right for you. Flea bites can mean misery for your cat. Advantage® ii monthly topical kills fleas through contact. 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Leading to sometimes painful and expensive consequences. So the question is, who really needs one, and might they not be necessary . Heres nbcs anne thompson. Reporter the cardiac stress test monitors flood flow for potential blockages. But one of the nations most respected cardiologists said the test is often unnecessary. Too many people get stress tests. Reporter stress test numbers are skyrocketing, from 1. 6 million two decades ago to 3. 8 million. What harm could a noninvasive test cause . Its important to understand that stress tests are not very accurate. Theyre going to lead to other procedures that are more expensive, more invasive, involve more risk, and more consequences. Reporter the mayo clinic said these tests are only right half the time. As runner David Johnson knows. I bet you thought, im going to ace this, given the fact that you run marathons. Yeah, it was fun. It was challenging. You get to see how far you can go. Reporter the results stopped him cold. A possible abnormality in this otherwise healthy 54yearold. It gave me stress for sure. Reporter a followup test said he was fine. But a stress test the next year showed the same problem. So he went to mayo where his doctor said he never needed the test. The more you do to patients, the more you earn. So there is an incentive. It is a perverse incentive. Reporter the stress test costs 200, but the followup tests can run from 2,000 to 40,000. Stress tests can spot trouble. Still, a Government Panel in the American College of cardiology say the tests are meant for people with multiple risk factors, including high cholesterol, high blood pressure, diabetes, Family History of heart disease, and smoking. Johnson, now 60, is still running. Im doing just knowing its important to talk to your doctor about whether you really need a stress test based on your risk factors. Anne thompson, nbc news, chicago. We are back in a moment with a very unwelcome surprise for some very angry drivers. 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Live big. Caught on camera, a horrifying moment at sea when a boat packed with migrants capsized off the coast of libya. Hundreds were thrown into the water. Some clinging to the side of the vessel. The italian navy said at least seven people died, but more than 500 were rescued. A huge headache in italy after a long stretch of road collapsed next to a river in florence. It took at least 20 parked cars down with it, some filling with water. The collapse stretches longer than two football fields. The first family may have just picked up new digs for after they leave the white house. Politico reporting the president and first lady will live in a spread in the d. C. Neighborhood. It was last sold two years ago for over 5 million. The obamas want to remain in d. C. Until sasha graduates high school. No confirmation from the white house about that politico report. Coming up next, america the beautiful. Were going to take a road trip celebrating a century of our nations parks. You dont want to miss it. Diabetes, you may know what its like to deal with high. And low blood sugar. Januvia sitagliptin is a oncedaily pill that, along with diet and exercise, helps lower blood sugar. Januvia works when your blood sugar is high and works less when your blood sugar is low, because it works by enhancing your bodys own ability to lower blood sugar. Plus januvia, by itself, is not likely to cause weight gain or low blood sugar hypoglycemia . Januvia should not be used in patients with type 1 diabetes or diabetic ketoacidosis. Tell your doctor if you have a history of pancreatitis. Serious side effects can happen, including pancreatitis which may be severe and lead to death. Stop taking januvia and call your doctor right away if atitis. Tell your doctor right away and stop taking januvia if you have an allergic reaction that causes swelling of the face, lips, tongue, or throat, or affects your breathing or causes rash or hives. Kidney problems sometimes requiring dialysis have been reported. Some people may develop severe joint pain. Call your doctor if this happens. Using januvia with a sulfonylurea or insulin may cause low blood sugar. To reduce the risk, your doctor may prescribe a lower dose of the sulfonylurea or insulin. Your doctor may do blood tests before and during treatment to check your kidneys. If you have kidney problems a lower dose may be prescribed. Side effects may include upper respiratory tract infection, stuffy or runny nose, sore throat, and headache. For help lowering your blood sugar talk to your doctor about januvia. Try cool mint zantac. Hey, need fast heartburn relief . It releases a cooling sensation in your mouth and throat. Zantac works in as little as 30 minutes. Nexium can take 24 hours. Try cool mint zantac. Dont let dust and allergies get and lifes beautiful moments. With flonase allergy relief, they wont. Most allergy pills only control one inflammatory substance. Flonase controls six. And six is greater than one. Flonase changes everything. Wopen up a lot of dawn. Tough on grease. Yet gentle. Dawn helps open. Something even bigger. Go to facebook. Com, dawn saves wildlife. After a long day, jen stops working, but her aleve doesnt. Hey mom because aleve can last 4 hours longer than tylenol 8 hour. What will you do with your aleve hours . Finally, the unofficial start of summer is near, and many will spend this memorial day in one of our nations parks. This year, the park service turns 100 years old. These National Treasures are more popular than ever. 300 million visitors last year alone. Our Kevin Tibbles tags along for a road trip to behold them from sea to shining sea. Reporter they are vast and majestic and they are ours. Arches. Aztec ruins. Reporter extraordinary natural vistas that have seemingly stood since time itself began. Tall grass prairie. Yosemite. Reporter and it has been 100 years since the National Park service was formed to preserve them. Atlantasester and jacob have set out to celebrate centennial home sweet home. Reporter but first, learning how to back up the airstream. So, why are a couple of 30something bloggers crisscrossing america . I love exploring. Reporter and that is our National Park legacy in its purest form. 411 areas, 59 major parks, 84 million acres. You see something new every day that we didnt know existed before. Reporter and a selfie at each location. Today its pinnacles National Park in california, with rugged volcanic spires and rare, soaring condors. Perhaps the greatest discovery somebody can make in a National Park is finding something out about yourself. You get more connected, more invested into preserving it. Reporter when the summit is reached, a communion of sorts. Then, of course, being 21st century explorers, time for a few more selfies. Does it make you proud . It does. This is in our own backyard. Reporter a backyard that will take your breath away. Kevin tibbles, nbc news, pinnacles National Park, california. Great journey. It just took two minutes. Thats going to do it for us on a wednesday. Im lester holt. For all of us at nbc news, ank you for th lights, ka many ra, access. Ive never felt like this before. Alisan porter, team christina. Dueling new champs for dancing and the voice. Which winning team is breaking