Attention from the expected news of the president and his wall. At the department of homeland security, President Trump said his immigration crackdown will save thousands of lives, millions of jobs and billions of dollars. Beginning today, the United States of america gets back control of its borders. Reporter keeping his Signature Campaign pledge. I will build a great, great on our southern border. Reporter it would run 1900 miles and cost an estimated 15 to 25 billion. Because mexico is refusing to pay, mr. Trump asked congress to. At this point his goal was to get the project started as quickly as possible using existing sdpundz resources. Reporter cheaper drones, towers and detectors would work, said john mccain, the senator from arizona. Yes, we can secure our border, but it isnt just with, quote, building a wall. Reporter President Trump also order criminals without papers to be deported. And to cut off federal funds to cities like new york that offer sanctuary to undocumented migrants. I have no higher duty than to protect the lives of the american people. Reporter but on the day the dow hit 20,000, the president again distracted from his own moves on prosperity and security, tweeting, i will be asking for a Major Investigation into voter fraud. Using his new powers to escalate his unfounded claim that he lost the popular vote because millions of what he called illegals voted. Think about it, those are among the same kind of people that President Trump moved today to keep out and kick out of our country. Live at the white house, steve handelsman, news 4. Thank you. We wanted to know what local voting officials thought about mr. Trumps voter fraud claims. At the bottom of the hour, well hear from some of them whether its possible and why theyre taking mr. Trumps comments personally. Again, that otr nbc news Gadi Schwartz went down to the u. S. mexico border to get a closer look at the barrier thats already in place. Reporter this fence is just part of about 700 miles of border fencing that separates the United States from mexico. This fence cost about 6. 5 million a mile to build. Trump wall will be considerably higher than that. A large portion of that is obviously not protected by a fence. But there are a lot of natural obstacles from the rugged terrain in arizonas desert to the rio grande river. Some of that land is actually privately owned. Mexico insists it wont pay for any wall, but white house Officials SayPresident Trump will raise the issue when he meets with mexicos president next week. Gadi schwartz will have more from the border after our broadcast on nbc nightly news. President trumps executive action also threatened to strip dont report undocumented immigrants. The district is one of several sanctuary cities in our region. Kristin wright is in northwest d. C. With some reaction. Reporter well, doreen, yes, were here with protesters. What theyre doing here is theyre organizing. What you see is these protesters, many of them immigrants, what you see here is them mobilizing. The mayor has said d. C. Is a sanctuary city but there hasnt been a clear definition about what that means. Were trying to give that definition to the administration here locally. Reporter immigrant communities protesting tonight in northwest d. C. Demand to be heard and now. Migration is beautiful. The idea that one can pick up and move to another country. Reporter earlier today d. C. Mayor bowser talked about protecting the citys sanctuary status and also about the fear in the immigrant community. Ur always that we want people, d. C. Residents, to not fear calling on their government. When people fear calling the police or calling on the government for help, it makes the entire city less safe. Reporter meanwhile, in frederick county, maryland, a voice known for speaking out against illegal immigration believes President Trump is doing the right thing. Sheriff chuck den kinz says the executive order must be followed. We have effectively built a fence around the county. Im okay with it. I think theres going to be minimal impact on the families. I think some families will be affected but life. Thats an annual antiabortion rally. News 4s Mark Segraves is on capitol hill. Youve been talking to park service and march organizers today. What are you learn being security changes for this Upcoming Event . Reporter good evening, doreen. A big change we just learned about today because of some highprofile speakers who will be at the stage friday morning, including white house adviser kel Kellyanne Conway who has secret service detail. Because of that, there will be fencing around the stage as well as checkpoints to get in. That means you go through a bag check if youre going to that event that starts at 12 00. Thats right on the lawn at the base of the washington monument. Thats really the biggest security change, because up to now, weve been told there would be no checkpoints, no fencing, people would be able to come and do. Thats the biggest change. Thats why theyre telling people, if youre going to the speeches, you want to get there early. Mark, based on the crush of people at the womens march and violence we saw at the inauguration, these folks have any concerns about this going on saturday . Reporter chris, i put that question to the police chief this week, to the president of the march for life, and to the National Park service. While they all play down any possibility of either violence or riots like we saw on friday, disrupt the inaugural parade or the huge crowds on saturday that they saw, theyre playing that down. But the president of the march for life did say people coming to this march on friday have actually been energized by what they saw on tv friday and saturday. Take a listen to what she had to tell me. Lots of Prolife Group applied to be partners because prolife is prolife. They were sadly turned down. Weve seen a frustration at the level of many women who have never participated in the march for life but they want their voice heard, too. Mark, we are washington is getting is kind of worn out from all the demonstration and it is crowds. What happens to all the trash that all these groups leave behind . The signs alone are probably a lot. Reporter anybody whos lived in d. C. As long as we have or even if just for one year and they see the cycle of all these protests, we know they all carry signs. Most signs are left behind. We saw the huge pile in front of the trump hotel, the huge piles on the mall. The park service cleans all those up. They told me after saturdays womens march, by sunday afternoon the mall was completely cleaned. They throw all those signs away. They did say, interestingly enough, one group asked to get some signs to preserve them. They also have had people calling in and saying they want to donate money to the park servic h thank you. Some of those signs could just get repurposed for other protests and rallies. Thank you so much, mark. Appreciate it. You know, chopper 4 was over the scene of a deadly accident in frederick. A dump truck rearend wanted an suv this morning at the intersection of i70 and 270. The impact sparked a huge fire. The person driving that suv was killed. Traffic slowed down right before the crash to accommodate a congressional motorcade. Several buses were carrying lawmakers to a retreat in west virginia. But the motorcade itself wasnt involved in the accident. As we noted earlier, wall street passed a huge milestone this afternoon. For the first time ever, the Dow Jones Industrial average closed above 20,000. The dow has gained 2,000 points since the president ial election. Cnbcs Courtney Reagan says investors are giving credit to Donald Trumps probusiness policies. It rose because of hi and tax cuts. Those are all very probusiness. Thats why weve seen stocks run since that. Now that hes in office and signing executive orders that appear to be followthroughs on his intentions, thats why we continue to creep higher. Some analysts say the rally is also partly due to positive economic data. For that they give credit to president obamas administration. We get a break from winter but turns out only for a day. Storm team 4 is tracking some changes that could bring rain back to our area. What do you think, doug . You said rain and not snow. The snow back toward chicago not moving our way. After a day we saw today, look at the High Temperatures across the area. 70 in roanoke. 60, we actually hit 61 officially at the airport today. 58 in hagerstown. 62 in elkins, west virginia. Very mild for this time of year. Tomorrow another mild day. Were tracking a frontal making its way our way. As it moves through, we will see showers overnight tonight into early tomorrow morning. Then the cold air, which is also back to the west, that cold air will filter in. Once again, not tracking snow with this, but i am tracking the much colder air. Warm overnight, a few showers towards the morning rush. Talk about that. Much colder into the weekend. Of course, staying dry most of the next ten days. Ive got your complete forecast. Well take hour by hour for the commuter forecast. Ill see you back here in about seven minutes. Who can turn the world with her smile trail blazer, legend, inspiration. Those are just some of the words being used to describe Television IconMary Tyler Moore. Who passed away today at the age of 80. She shot to stardom in the 1960s on the Dick Van Dyke show but her most iconic show came on the Mary Tyler Moore. Mary richards fought for pay and womens rights while working up the ranks at a television station in minneapolis. It completely changed the way women were portrayed on tv. Behind the scenes, moore struggled with diabetes. She was a strong advocate for funding research. We dont know if diabetes actually contributed to her death. Condolences poured in on social media this afternoon. Many actors from the show shared their memories and women, essentially women in television, explained just how much the Mary Tyler Moore show inspired them. Her show was on when i was in high school, college. I wanted to be just like her. I wanted to work in a news room full of characters and here you are. There you go. Her friends, her relationships with her friends, her apartment, everything. I remember all of it. You know, wendy said the same thing at the top of news 4 at 4 00. I thought it was one of the first shows to show that your your coworkers could be your family. She didnt go home every night to a husband and kids. Her coworkers were her family. N fiercely pushed ahead, not always knowing if she was going in the right direction. She was she was quite a role model for a lot of us. Well, heres a look at whats still ahead. A daring demonstration downtown has cops at the ready and people reaching for their cell phones. That story coming up. Plus, you saw it as it happened, as it was breaking this morning. Now the iteam goes further to find out whats behind a rise in accidents involving pedestrians and trains. It can happen in an instant as police try to find who was snatching wallets in local shopping malls. We work with you to find ways to keep your money safe. Robert ive always had high blood pressure. But now i was getting these terrible headaches. And i was tired literally all the time. Something wasnt right. Most people dont find out they have Chronic Kidney Disease until it is very advanced. In fact, my friend ron paul was one of those affected. But a simple test can help save your life. Talk to your doctor or contact the gw ron and Joy Paul Kidney Center to find out how you can get tested. Before you find out that way, find out this way. A few blocks from the white house greenpeace activists clied a construction crane to protest what they call the president s action against the environment. Pat collins is standing below where police are hoping theyll come down. Its been a long day up there, pat. Reporter real long, doreen. Its been going on for more than 12 hours. There are only seven protesters and a really long sign, but it brought a good portion of downtown to a stop. The crane, 270 feet in the air. The banner, 70x35 feet. A daring demonstration by greenpeace climbers. The message in big, bold letters resist. A protest of the Environmental Policies of President Donald Trump. It was a cameraclicking, trafficstopping, highwire demonstration that had people here talking. This is downtown d. C. Reporter thats april, shes from akron, ohio. She did a personal newscast for her friends back home. We dont see stuff like this in akron, ohio. Reporter so youre doing your own personal newscast. I am doing my own personal newscast, yes, i am. Reporter what doou reporter these climbers moved in and took control of the crane in the dark hours of the morning. By the Time Construction workers got here, the demonstrators were busy on those banners. What do you make of this . Hey, not even really sure. See crazy stuff every day. Never expected to see Something Like this today. Reporter it was dark when they went up there, right . 4 30, 5 00. Reporter it started in the early morning. It has now turned into a waiting game. The climbers rolling up the banner. And theres hope that soon theyll come down on their own. Everyones talking about the police going up there. If i was a cop, id be like, no way. Im not scaling that to get up there. Reporter wait them out . Yes. Reporter and the standoff continues on. The greenpeace climbers up there, the cops down here. Waiting to meet them. Doreen, back to you. Lets hope they get down thank you, pat collins reporting. The sight at 15th and l northwest where greenpeace protesters have been hanging used to longtime home of the washington post. After more than four decades the post moved a few blocks over to k street and demolition has been going on at this site since 2015. The new site will house fannie mae, around the corner from nbc 4. Chopper 4 flew over two separate train crashes today. First involving an amtrak train. It crashed into a tanker truck. The incident happened just before 9 00 a. M. North of the quantico. No passengers were hurt. They did have to temporarily suspend service for a couple hours. The train itself was heading from norfolk up to new york city. Also today mark tells us one person was hit and killed when a college park mark station. This type of accident is increasingly common in our area. According to recent investigations from our iteam. Good evening. Our review of federal Administration Railroad records indicate 34 people have been hit and injured or hit and killed by trains while walking near the tracks just in the past year, just in our area. That includes a 58yearold killed in Prince William county last year and a teen killed last summer in prince georges county. Our recent news 4 iteam investigator showed why these incidents are so frequent. There are several areas, including one in hyattsville here where people frequently and illegally walk across the tracks as a shortcut. These are hot spots in which trains have struck and injured people several times in recent years. We captured some of these illegal crossings on camera as part of our investigation. Some of the trespassers with whom we spoke said they know the danger but think theyre alert and quien several of the incidents we reviewed included mark commuter trains on amtrak and csx tracks through maryland, some involve teenagers, one walking Near College Park with ear buds in her ear. Thank you, scott. Scott has detailed before, more than 100 people have been hurt or killed walking along d. C. Railroad tracks between 2012 and 2015. Can you see a review by the news 4 iteam and all of our past coverage in the nbc washington app. Search train track dangers. President trump is talking about widespread voter fraud again. Now calling for an investigation. Were digging deeper, looking for evidence and hearing what elections Officials Say about the claims. A maryland man was sentenced to life in prison plus 20 years for sexually assaulting a woman with mental illness. Coming up ill tell, y25eiy y16fy a day like this is quite a gift in january. Doug, chris and i are lamenting we didnt get to spend enough time outside. We needed a few more hours. I agree with you. Having to come into work at 1 00, 2 00. I did see you, doreen. I was watching you, you were about to come into the station and then you turned and went by the picnic tables. Its true. I sat outside doing some minutes. Those last few drops of sunlight before i had to come into the building. You wanted to do it too, admit it. I did, but you already took up the picnic table. Show you how things were going. It really was a great day today. High temperature of 6 1. So many of you got out and enjoyed it today. I saw a lot of people around the lunchtime hour enjoying it. Take a look, our photographers in rock creek park. That guy has no long pants and no hes got shorts on, too, right there. Just a perfect afternoon. The ducks loving it, too. Down towards rock creek. Current temperatures sitting right now at 55 degrees. Still very mild. Temperatures dropping through the 50s to about 49 degrees by 11 00. Again, another very nice night. 55, leesburg. 54, warrenton. Hagerstown hit 55. Rainfall, not in the immediate area but its just to the west i mean, just to the west. Take a look. Its moving quickly our way, back towards west virginia. It will be here in about the next six to eight hours or so, as it moves in through. This is our cold front. You can see that cold front back to the west. These showers out ahead of that cold front. You can see the cold air wrapping in behind this system. Chicago will go from rain to snow later tonight. That colder air will move on in. Lets time it out for you early tomorrow morning, as we make our way through the night tonight. By 11 00, you notice the cloud cover around the area. More clouds tomorrow. Notice around