Announcer from nbc news World Headquarters in new york, this is nbc nightly news with kate snow. Good evening,. In 18 cities across mexico today thousands joined demonstrations against President Trumps policies, the largest gathering in mexico city. Those who joined the antitrump rally cited the president s continued calls for a border wall and promises to dismantle nafta as catalysts for their action. It all comes as the white house is considering how to move forward on its immigration policy after losing in court last week. We begin tonight with Kelly Odonnell in florida. Reporter demonstrators in palm beach. Both Trump Supporters and detractors lined his route to the airport. President trump returns to washington tonight with International Friendships facing tests. Today in mexico city. Thousands marched to protest President Trumps plans for a border wall. Anger directed at mr. Trumps own image. Human and economic divisions between the u. S. And mexico, including the trade deal nafta also affect canada. Tomorrow, Prime MinisterJustin Trudeau meets mr. Trump at the white house. Trudeau directly criticized the president s sevencountry travel ban tweeting a message for refugees. Welcome to canada. Defending that travel ban across Morning Television today, the president s Senior Policy AdviserStephen Miller lashed out at the courts. We have a judiciary that has taken far too much power and become in many cases a Supreme Branch of government. Reporter the white house weighing options. To ensure that our immigration system does not become a vehicle for admitting people into our country who are hostile to this nation and its values. Reporter millers boss liked what he heard. The president tweeted great job. But miller was clearly unprepared to answer for mr. Trump about controversy around National Security adviser Michael Flynn who told mike pence he had not discussed sanctions with russia, but monitored calls suggest he did. If you were caught misleading the Vice President of the United States, would that be considered a fireable offense in the Trump White House . Its not for me to answer hypotheticals. It wouldnt be responsible. Its a sensitive matter. Reporter and during his weekend here, the president also faced a first test from north korea. A Missile Launch prompted a latenight Television Appearance with his guest, the japanese Prime Minister. Some onthespot diplomacy with mr. Trump saying only that he fully supports japan. Kate . Kelly odonnell down in florida. And late today, north korea claimed that missile test was successful. The pentagon said it was a medium or intermediate range Ballistic Missile and did not pose any threat to north america. Its all being followed closely though by south korea, and our kier simmons is in seoul tonight. Kier . Reporter kate, good evening. Here in south korea many people believe that this was a test not just of the north Korean Missile but a test aimed at the president of the United States. The south korean government saying that it believes this was a direct and deliberate challenge to the new administration. Around the capital of south korea here, seoul, there are bomb shelters, but what many u. S. Officials fear is that north korea has vowed to develop a long range nuclearcapable missile that would be able to reach the mainland of the United States. Kate . Kier simmons in south korea. As the fallout continues from russias meddling in the u. S. President ial election, it turns out that this countrys election is not the only one russia has tried to influence. Moscow is exerting more and more political influence in more political influence in europe, supporting nationalist far right candidates whose voices are growing louder and louder. We asked nbcs matt bradley to take a look at the role russia is playing. Reporter american troops in poland, a show of force meant to deter russias growing ambitions in europe, but Vladimir Putins advance there is far more subtle. Moscow is quietly supporting europes far right populist with loans, cooperation and propaganda. Its a very clear stance for the russian government that they are in support of populist radical right candidates and they sympathize with these movements and see them as destabilizing european political systems in the eu in general. Reporter a new political front line as major european elections loom, even as the u. S. Reels from russian political interference in its own president ial election. For europes right, putins russia represents a nationalist tradition they feel their own countries have lost. The head of austrias antiimmigration Freedom Party signed a fiveyear cooperation deal with putins party. There were claims we would get Financial Support from russia, he told us, but thats absolutely not true. He says the deal is about making peace with russia, not taking money from them. Marine le pen of frances antiimmigrant National Front took a nearly 10 million loan from a moscowbacked bank in 2014, and russian state media are now smearing her strongest opponent in the elections this spring. As right wing populist parties across the continent cozy up to moscow, european institutions are taking notice. The eu created an agency called estratcom to counter russias antieurope propaganda, and meanwhile nato is deploying thousands of u. S. Troops to europes eastern fringe, a new cold war on the political front lines that risks heating up. Matt bradley, nbc news, vienna. In hamburg, germany, there was chaos for a time today at the airport at that city. About 50 people complained of eye irritation and had some problems breathing after a corrosive substance leaked through the air conditioning system. Officials say the source might have been pepper spray. The airport was closed briefly. Authorities say the incident was not considered a terrorist attack. We have a breaking news story. Heres the very latest. Im Steve Patterson in los angeles. Breaking news of a possible dam spillway failure and flooding in northern california. The Sheriffs Department is now ordering the immediate evacuation of communities downstream from the oroville dam. 50 to 100,000 residences could be affected by this emergency evacuation order. The spillway has led to severe erosions and the dam could collapse within hours. Water was raging after heavy water saturated parts of california over the last month. Tonight, officials warning residents, quote, this is not a drill. Stay with nbc for the latest developments. Now back to kate snow. In the west, more guns were sold in that state than ever before. And california was not alone with a surge of gun sales as the fight over guns is heating up. Nbcs katie beck has more on all of this. Reporter gun enthusiast David Martinez has owned guns all his life. Recently he found an urgent reason to buy a new one. Once i heard that they are going to ban the ars i stopped to get one. Reporter hes talking about californias bullet button ban. The state made it illegal to sell rifles that have a button shooters can use to reload faster. The ban passed in july of 2016 but took a few months to go into effect. This whole wall right here was literally completely empty in december. Reporter they were cleaning you out. They were cleaning me out. Reporter Gun Store Owner vince torrez says the ban helped make 2016 his busiest year in decades. So its your opinion that antigun laws really have an opposite effect . They push people to the store to buy more guns . Exactly. Especially in california. Reporter california gun sales surged last year, selling over a million firearms for the first time ever. We need comprehensive background checks. Reporter and nationwide a similar trend. A 19 spike in background checks, the tumultuous election season where Hillary Clinton could have been in the white house spurred sales. They thought if she would have been elected, she would definitely have gone 100 after the gun industry mr. President. Reporter now with President Trump in office promising Second Amendment protections theres no national catalyst for sales. Agendas are surfacing on both sides of the issue in states though. Lawmakers in maryland and new mexico want to tighten background checks while ten other states are aiming to allow owners to carry without a license. Overall the gun industry is bracing for a slowdown in sales because of solid republican control in washington. Its a catch22, but, you know, i would rather keep my guns. Reporter a balancing act that keeps businesses and lawmakers chasing a moving target. Katie beck, nbc news, los angeles. And now an issue that generated years of debate all about a simple question that was complicated. Whats in a name . For Yale University the name was calhoun, a building on campus, but also a divisive figure in American History and its slavery past. As Morgan Radford reports, the issue has finally been resolved. Hey, hey, ho, ho reporter after months of protests, Yale University announced it will change the name of calhoun college, one of its dormitories named after john c. Calhoun. Seventh Vice President of the United States and yale graduate who supported slavery. This is a very, very happy moment for all of us. Reporter the billing will be renamed to honor grace murray hopper, a 1930 graduate and celebrated computer scientist. People are happy with this name. Reporter last april, yales president said they wouldnt change the name because they didnt want to erase the universitys past. Now, ten months later, this statement. Calhouns legacy as a white supremacist and a National Leader who passionately promoted slavery as a positive good fundamentally conflicts with yales mission and values. They realized that they had made a mistake when they saw how angry all the students were that the name was staying, so ne they finally did the right thing. This comes after similar calls for change across the country. In 2015, the university of North Carolina changed the name of saunders hall, originally named after a leader of the ku klux klan. That same year princeton students held sitins hoping to drop Woodrow Wilsons name from their university, citing the former president s glowing praise of the kkk and his support for segregation. This questioning around the history of slavery and the history of naming is really the tip of the iceberg of how do we maintain diversity in our institutions of Higher Education . How do we maintain opportunity and access . Reporter well, yales president says they now have rules to ensure that renaming buildings go through a review process and really respects the past. See, this is all a part of a wave of colleges now being forced to revisit that past and really make those changes in the present. Kate . Morgan radford, thanks so much. Still ahead tonight, another immigration story that has been largely forgotten. What will happen to hundreds of cubans stuck in limbo . And his voice was the definition of smooth. Saying goodbye to a jazz legend. All night long were in this love together were in this love together it was his greatest hit, were in this love together, the hit by the great al jarreau, one of his most successful albums breaking away from 1981. With his light and breezy style he was a fixture on the jazz and pop scenes for four decades. The sad news that al jarreau died this morning in los angeles. He was 76 years old. And an American Military hero has died. Retired Lieutenant GeneralHarold Hal Moore was best known for saving most of his men in vietnam during the first major battle between the u. S. And north vietnamese armies. It was in 1965. That battle became the basis of a book moore cowrote we were soldiers once and young, and the movie stars members gibson that followed. General moore was a graduate of west point. He was 94 years old. As the trump administrations policies on immigration play out, there is another action, this one by president obama that has left hundreds of migrants in limbo. They are cubans who plan to enter this country via mexico. We get more from nbcs tammy leitner. Reporter the United States is just 100 yards from this dusty Mexican Border town, yet it might as well be 100 miles for these cuban migrants. For years like people like Lady Martinez had years to set foot in the u. S. To gain Refugee Status here. He found after traveling to mexico that traveling here would not mean a reunion with his wife in miami. Martinez says hes been waiting here since january 14th. His wife lady del rio made it to the u. S. Just before the border closed, leaving behind her husband and two teenage daughters. Now she is in the u. S. Alone, desperate. The family sold their car and home to make the journey, and now they have nothing left in cuba. Trapped midjourney, apart. Many cubans believe the repeal of wet foot dry foot was coming causing a rush to the border. Nearly 57,000 cubans entered the u. S. In fiscal 2016, more than twice the number in 2014. One thing that hasnt changed, a hightech effort to spot migrants in the rough waters between florida and cuba. We can be about 25,000 feet away, and we can tell what kind of boat it is and how many people on board. Reporter some makeshift boats barely seaworthy. Were about 40 miles off the coast of cuba, and its not uncommon that the coast guard finds people down on these small islands. They have either gotten lost or they have been abandoned by smugglers, and in that case, it truly is a matter of life or death. For those like this woman and her son, returning to the communist island is not an option. Saying she would rather die than return. Experts estimate there are more than 500 cubans now at this Border Crossing alone, all dreaming of life in america. To be able to work and be free. For migrants, that means waiting here at the border as long as it takes. Tammy leitner, nbc news, miami. And coming up, a new effort documented in a new film to crack down on the exploitation of children. A new documentary opened in select cities called i am jane doe. The film shines a bright light on how young women are being sold online and the legal fight against one particular website. The film follows several families. Nicoles daughter left home at 15. Trying to wrap my head around how you take a child that was a soccer star, a violinist and 36 hours later shes being sold on a website. Reporter and emmaes mom had used the website backpage. Com to buy and sell couches and tvs and then found her missing 13yearold daughter for sale. It was the third link from the top. It had stars and hearts, and it said young and new. I clicked it, and there was the pictures of my daughter. Reporter she had been trafficked for sex for nine months. Its happening in every city and every town across america. That blew me away. I had not a clue. Reporter after a twoyear investigation a Senate Subcommittee found backpage edited ads to avoid red flags as a former moderator describes in the film. We had a list of words that we went by that were not supposed to be used in the ad. Reporter i spoke with subcommittee chair senator rob portman on msnbc thursday. Backpage. Com has about 80 of the commercial sex traffic and have almost a monopoly on this. Thats validation of the findings in the report. Reporter a day before his subcommittee held a hearing last month, backpage announced it would remove its adult content section because of, quote, government censorship. Backpages executives refuse to answer questions at the hearings. Based on the right provided by the first and fifth amendments. Reporter but for years the company has argued backpage is not responsible for content that third parties post. Backpage also argued it has helped Law Enforcement fight trafficking, but in two new lawsuits against backpage filed just last week lawyers say young girls are still being advertised, just on a different part of the site. We believe in a fully and vibrant internet, just like everybody else, but can these companies do more to eradicate this problem . Absolutely. Reporter there are multiple civil cases against backpage right now and a criminal case involving executives. When we come back, it began with a picture. How two families with different perspectives found common ground. With all the division in the country right now, lets end tonight with the story of unity about two families, one muslim, one jewish who came across each other at an immigration protest in chicago last week. You may recall the now famous picture. The kids talking as they sit on their fathers shoulders, and that was only the beginning. Heres kevin tibbles. Reporter when special guests are coming, everything has to be just right. From the handmade welcome on the door to the setting of the table, and when the new friends arrive, greetings and gifts. The six members of the yildirin family are muslim and the five bendatappels are jewish. They will be sharing the traditional jewish shabiat dinner together. As a jew the best thing i can do is get up and stand for my muslim neighbors. Reporter jordan bendat appell is a rabbi, and hes talking about this picture taken during immigration protests at chicagos ohare airport. Jordan holds his 9yearold son adin on his shoulders. And fatil yildirin, originally from turkey holds his 7yearold daughter meryum. The picture went viral. People think that muslims and jews cannot get along but actually maybe the governments cannot get along, but the people get along. Reporter as the family pause for their family prayers, young adin watches intently from the basement steps. Its nice to meet new people. Reporter meryum is a little younger. Whats it like being at his house now . But she did present adin with this coloring of the encounter at the airport. Jordan says hes received a few nasty emails as a result of the picture, but far more positive ones from many muslim nations. Tunisia, algeria, egypt. Reporter places you never thought youd get a postcard from . Yeah, absolutely. Reporter did you take any heat for doing this . A tremendous amount. Reporter still, as the two families retire to celebrate their dinner, there was already talk of future dinners, future interfaith gatherings and future friendships. Kevin tibbles, nbc news, deerfield, illinois. Nice to celebrate the positive. That is nbc nightly news on a sunday night. Lester holt will be back here tomorrow. Im kate snow reporting from new york. Ill see you tomorrow on msnbc. For all of us here at nbc news, have a great night. A Mass Evacuation underway nort. Because of a dam spillwa the nations tallest dam. A Mass Evacuation now under way north of sacramento because of a dam spillway. It is about to fail at any moment. The news at 6 00 starts right now. Good evening to you and thank you for join ing us tonight. Im peggy bunker. Take a look at pictures from the chopper in the oroville dam. What we heard is a threemile backup and people trying to get out of oroville because the water is spilling out of oroville lake in places it shouldnt be. A concern that the section of the spillway will send water rushing downstream