Conservative stories. This morning, how facebook is responding. Sight to behold. That is a ninehour flight sunrise right there. Every minute of it. Matt and al take in the Natural Beauty of new mexicos stunning white sands. The next stop on our celebration of 100 years of National Parks. Today, tuesday, may 10th, 2016. Announcer from nbc news, this is today with matt lauer and savannah guthrie, live from studio 1a in rockefeller plaza. Good morning, everybody. Welcome to a special split edition of today on a tuesday morning. Matt and al are at the breathtaking White Sands National monument in new mexico. Natalie and i are camping out at studio 1a. Thank you for bringing us the star wars set. Yeah, it is. Its like something from another planet. It really is. Its going to be one of the most beautiful sights on this p sun comes up and hopefully warms things up around here. Thats right. And this is actually the star of this show. Its gipsome, covering 275 square miles of incredible landscape. Were going to show you around. The sights, the sounds. Which, by the way, there are few of. Perfectly quiet here. Al will take you deep underground to Carlsbad Caverns in a little while. Very cool. Looking forward to that. Well see you in a bit. Our top story, the powerful tornadoes that cut a path of destruction across the plains overnight. Gabe gutierrez is in wynnewood, oklahoma, 60 miles south of oklahoma city. Good morning. Savannah, good morning. This home, obliterated, ripped from the foundation. Debris everywhere. At least two people were killed in oklahoma, including a man in his 70s. You dont often get to see the explosive power of a tornado outbreak quite reporter it is a rare, intense glimpse at natures fury. A deadly, monster tornado, almost a mile wide, captured up close on camera, chewing through everything in its path. This morning, wynnewood, oklahoma, is assessing the damage. No structure spared. Brick homes, mobile homes, woodframed barns, ripped apart. It blew off of its foundation and is pretty much parked in the driveway. Reporter at least half a dozen twisters. Right there you need to back up. Reporter hammered the state all evening. Hits another structure. Reporter across the country, at least 19 reported tornadoes, including touch downs in nebraska and iowa. Dangerous, dangerous situation here. Reporter some in oklahoma didnt left the hail stop their golf. Other weather watchers were amazed at what they holy cow. Wow. This is an ef4 tornado. No doubt about it. Ripping the town apart. Reporter today, it is the small things in wynnewood that loom large. Anniversary card. But were okay. Reporter lisa buckner survived by racing to her emergency underground shelter. It was scary. Very scary. Especially by yourself. Reporter her home is shredded, but her will is not. Never in my life. I dont want to do it ever again. It was horrifying. The weather is expected to be drier today, which will help the cleanup effort. Theyre bracing for another round of potential Severe Weather tomorrow. Savannah and natalie, it is, after all, the height of tornado season here. Terrifying images. Gabe gutierrez, thank you. We have a new look this morning at the likely matchup between donald trump and Hillary Clinton in the general election. This as trump prepares to meet th thursday. Well begin our coverage with nbc National Correspondent peter alexander. Good morning. Good morning. Ahead of the pivotal meetings in washington, donald trump faces a real challenge, trying to unite this fractured republican party. Paul ryans latest comments about trump may leave both men at least a little wiggle room over the partys convention, if they still dont see eye to eye. Hillary clinton. Donald trump. Reporter the fall fight coming into focus. Donald trump trailing Hillary Clinton nationally by five points. According to the latest nbc surveymonkey online poll. Paul ryan is deferring to his partys presumptive nominee, saying hed step aside as chair if trump asks. Hes the nominee. Ill do whatever he wants with respect to the convention. Reporter ryan with a reality check ahead of his thursday meeting with trump. If we pretend we are unified without unifying, well go into the fall election at half strength. That means well to win. Reporter what does ryan want . I want to know him and understand him better because i really dont know him. Reporter also on trumps docket, visits with leading republicans, whose sources tell nbc news want to discuss trumps tone. As voters head to the polls in nebraska and West Virginia im ivanka trump, and i want to remind you to vote for my father, donald trump. Reporter Chris Christie is heading up the transition team. The new jersey governor is promising to best serve the elect and the nation. A policy adviser says itll be challenging for trump to attract top talent. Marco rubio is stamping out speculation that he would be trumps running mate. Reiterating his concerns with trumps policies remain unchanged. Also this morning, ben carson, now one of Donald Trumps allies, requested take place ahead of trumps visit this week. The goal, to help warm the room for the trumpryan meeting. Interesting. To be a fly on the wall. Peter, thank you. While trump gears up for thursdays meeting, hes stepping up attacks on Hillary Clinton. Shes not taking his bait. Andrea mitchell is covering the campaign this morning. Good morning. Morning, savannah. Donald trump, surprising observers in both political par t parties by launching deeply personal attacks on hillary and bill clinton. It is likely to be a vicious campaign. Reporter Hillary Clinton courting independent women in suburban very, very. Focusing on issues like equal pay. I raise it all the time and, you know, im accused of playing the gender card and all of that. The fact is, it is a real problem. Reporter after Donald Trumps toughest attacks yet, repeatedly raising bill clintons sex scandals from the 1990s. Calling her an enable ler. She was an enabler. Shed go after the women and destroy their lives. She was an unbelievably nasty, mean enabler. What she did to a lot of those women is disgraceful. Reporter trump getting even more personal about the man who was once his golf buddy and wedding guest. Hillary clintons husband abused women more than any man that we know of in the history of politics, right . Reporter clinton responding monday. Donald trump has really gone after your husband, and even you as an enabler, for the scandals of the 1990s. Im going to let him run his campaign however he chooses. Reporter what is trumps evidence . No doubt, she did help rescue her husbands First White House campaign. After jennifer flowers accusations of an affair. Im not a little woman sitting here next to my man. I love him and i respect him. Reporte accusations that president clinton lied about an affair under oath first made headlines, Hillary Clinton gave this now famous response about the incident to matt on today. The great story here for anybody willing to find it and write about it and explain it is this vast, rightwing conspiracy that has been conspireing against my president since the day he announced for president. Reporter Monica Lewinsky said clinton had an impulse to blame the woman. Are his claims accurate . Do you feel a need to change the record . I have nothing to say about him and how he runs his campa n campaign. Women heavily favoring clinton over trump. It remains to be seen whether voters in 2016 will care about the scandal decades ago, or perhaps blame trump for resurrecting them. Thank you so much. We should mention, tda president dan quayles take when he joins us for an exclusive, live interview. We have breaking news overnight. A deadly stabbing attack at a train station just outside of munich, germany. Keir simmons is following that story for us. What can you tell us . Good morning, natalie. Europe has been on edge since the attacks in paris and brussels. Security services on alert. An assailant shouted god is great as he stabbed passengers, according to witnesses. The attack leaving bloody fo footprints. A 56yearold man killed inside the car and other injuries outside of the train cars. Discarded, a cell phone and pen. These were commuters on board the first train of the day. Two more men were outside the station. The attacker is arrested. A 2 knife. The munich Prosecutor Says it is too soon to know whether the attack was motivated by islamic extremism. Train personnel are praised for being courageous and preventing further attacks. Keir simmons, thank you. We are getting our first look this morning at theravaged massive wildfire. The flames move ad away from fo mcmurray. 80 of homes in one neighborhood burned to the ground, and the wreckage of melted cars remains on the road. Fire Officials Say almost 90 of the buildings in Fort Mcmurray survived. Justin trudeau vowed a multiyear commitment to rebuild the city. One of the nations top safety traffic organizations issuing a warning about a growing danger on the roads. Driving while high. Aaa says in some legalized marijuana, fatal accidents involving drivers who consumed pot are on the rise. Nbcs tom costello is in washington, d. C. , where pot has been legalized. Tom, good morning. Morning. 13 more states considering whether to legalize marijuana. Aaa Research Suggests that people high on pot let me start again. People are seeing a double in percentage, in the number of people high on pot, who then were involved in fatal accidents. Reporter driving under the influence isnt just about drinking and driving. So you smoked 30 minute ago, and youre saying that im not going to find any weed in this car . Reporter it can also mean driving while high. Why are you driving around smoking . Its not a good idea, right . Reporter Legal Marijuana is spreading across the country. 20 states allow medicinal use. Pot, including d. C. It is a growing danger on the nations roads. Driving is already a tough task. When you add a drug that impairs our ability to manage that task, its a recipe for disaster. You are impaired. You are impaired. I have seen impairment. I have seen what impairment does. Reporter its been two and a half years since mary waved goodbye to her 23yearold son blake at a suburban seattle restaurant. Seconds later at this interaction, he was hit by a car. The 33yearold driver now in prison, admitted he was high on pot. Blake died right in front of his mom. It was a very traumatic death. It was very it was a very horrific death. Reporter Washington State legalized marijuana in 2012. This morning, aaa reports the percentage of drivers who had smoked pot and were then involved in fatal crashes in Washington State more than doubled between 2013 and 2014. From 40 to was a brother, son, musician, student, computer wiz and so much more. He had lived a life that was way, way too short, but hed lived a hell of a life. Some states set legal limits of exactly how much thc, the marijuana chemical, can be in your blood for you to be considered legally impaired. The new aaa Research Suggests those are meaningless. It doesnt accurately reflect real impairment. They think its better for police to be empowered to determine whether somebody is impaired. Back to you. Tom costello, thanks so much. Now this troubling accusation leveled against facebook thats getting a lot of attention that morning. A former worker is claiming it censored politically conservative content from the trending news sidebar. Reporter this morning, facebook a scrambling to respond to accusations of political bias. After a report released monday says a team of employees had intentionally surprised articles from conservative news sources. They say they were coming forward to show they were to artificially inject trending stories into the module. In interviews, the curators describing grueling work conditions and humiliating treatment. According to a former journalist who worked on the project, they prevented stories about mitt romney, rand paul and other c conservative topics. Facebook boasts hundreds of millions of monthly active users. This story itself, a trending topic all night long. During facebooks april keynote address, Mark Zuckerberg touched on politics. We stand for connectingry person. For a global community. For bringing people together. Reporter in response to the allegations, a spokesman for Facebook Says it follows rigorous guidelines to ensure consistency and neutrality, and it works to be inclusive of all perspectives. We take allegations of bias very seriously. Facebook is a platform for people and perspectives from across the political spectrum. The Republican National committee released a statement on its website saying, in part, it is beyond disturbing to learn that this power is being used to silence viewpoints and stories that dont fit someone elses agenda. And other former curators interviewed denied consciously suppressing conservative news. The outlet was unable to determine if leftwing news c topics were suppressed. A lot of people will see if there is truth to it. Already trending on facebook. Lets go back to al, who is in new mexico with the thats right. A little brisk right now. Yes, it is. But it is going to warm up a little later. Lets show you whats going on. Unfortunately, Severe Weather is going to start heating up again. You can see, 4 meteorologist chuck bell. Another cloudy day with rain chances across the area, most of the rain right now is south of the metro area, those showers are headed on to the eastern shore. More light rain showers towards hagerstown and winchester, your rain chance for today stands at 80 . Temperatures in the mid to upper 50s now, thanks to the clouds and rain chances wont move much, up into the mitd 60s for highs this afternoon and anoth big temperature changes coming, not just here, but across the rest of the country. Well have that story comg in the next half hour. Guys . Thank you. Coming up, a Surprising New report tied to the tragic Christmas Day fire that killed three young sisters and their grandparents. Why the man who initially took the blame is now pointing finger at the girls mother. Well have her exclusive response. Matt . 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