The fbi and congress are investigating whether members of the Trump Campaign colluded with russia to sway the election. No evidence of that has been made public. And no one has been charged with any crime. One potential witness is a former British Intelligence officer, hired by trump opponents to find dirt on him in russia. He wrote a report of unsubstantiated claims that its now getting new scrutiny. Here is jeff pegues. Im really pleased. Reporter Christopher Steel emerged from hiding earlier this month after the dossier he compiled about then candidate trump associations in russia was leaked in january. It is all fake news. Phony stuff. It didnt happen. Reporter despite the president s dismissals of the dossier, sources say it is gaining increasing credibility in both the Intelligence Community and congress. Adam schiff, the top democrat on the house intelligence committee. Also according to steels russian sources the campaign is offered documents damaging to hillary clinton. Now democrats want to call steel to testify about his allegations that donald trump and his associates had business dealings with russian officials. Congressman jim heinz. Gets to something we dont talk a lot about which is really important. Which its do the russians have some form of leverage on President Trump . Either financial or otherwise . I briefed the president on the concerns that i had. Reporter the committees investigation was thrown into disarray yesterday when republican chairman devin nunes announced he had seen legal Foreign Surveillance that involved members of the trump transition team. He angered democrats by first briefing the media and mr. Trump. Committee. Sometimes you make the right decision, make the wrong ones you, have to stick by the decisions you make. Reporter getting steel to testify will take more than just democartic support. Scott, Committee Republicans would have to back the idea as well. After that, there its the possibility steel wont want to appear. Jeff pegues in our washington newsroom. Late today, a fourth victim of the London Attack died, 75yearold man whose name was not released. The others were a Police Officer, stabbed to death, a british woman, and an american tourist. Run down on a bridge near parliament. The attacker was also killed. And today Elizabeth Palmer learned more about him. Reporter the man who left this trail of carnage in the heart of london. No, no, no british born, shot by police during yesterdays attack. Overnight, officers raid the properties, linked to massoud who had a petty criminal record not under investigation for any links to violent extremism. Nonetheless, isis claimed today that he was a soldier of the Islamic State. He was also a terrorist. Who stabbed Policeman Keith Palmer to death. And murdered aysha frade, a teacher and mother of two of with his car and american kirk cochran from utah in london with wife melissa for their wedding anniversary. She was injured yesterday. And is still in the hospital. The injured came from 11 countries. Among them, French High School students, south korean tourists, and a romanian architect, andrea christea, in this Security Camera video, as the the car barrels along the sidewalk she tumbles off the bridge into the icy river. Just a day ago this whole area but in the famous british spirit of the keep calm and carry on the british authorities are determined things should return to normal soon as possible. Less than 24 hours after the attack, Westminster Bridge was open to traffic. In parliament, politicians observed a minute of silence. And then a heard toughminded message from Prime Minister theresa maye. We are not afraid. And our resolve will never waiver in the face of terrorism. Reporter tonight thousand of londoners gathered in Trafalgar Square for a vigil led by the muslim mayor sadik kahn. In part they came to honor the dead and in part to bolster solidarity among the living. Scott, the identity of Khalid Masood seems to have take ten the brisht Security Services by surprise. He was investigated years ago for peripheral links to extrem have to have slid right off the radar. Liz palmer at palace of westminster in london for us tonight. Liz, thank you. In israel today, a jewish teenager who holds both u. S. And israeli citizenship was arrested in connection with the wave of bomb threats phoned in to Jewish Community centers around the world. Anna werner has his story. Reporter the fbi worked with israeli authorities to arrest this 18yearold man. Who covered his face as he appeared briefly in court. A u. S. Law enforcement official tells cbs news he is believed to be responsible for most of the 160plus bomb threats phoned into Jewish Centers in the u. S. , australia, new zealand and canada. Israeli police spokesman, mickey the identification of the suspect, his profile, what were the motives behind him carrying out the threats. Reporter the source says agents now believe the suspect used an anonymousizer to mask his phone number and ip addresses and may have programmed calls in rapid succession. The man suffers from a brain tumor that nay have had an effect on his cognitive functions. The lawyer ghalit bosch. This is a young person. Because of his very, very serious medical condition. Didnt sever in the army. Didnt go to high school. Didnt go to elementary school. Evan bernstein with the antidefamation league. Even though there may be relief there is not time for institutions to ratchet back on security protocols. Maintain diligence, not get complacent in any way. Reporter that 18yearolds lawyer says he will be sent for a medical evaluation. Scott, not yet clear whether u. S. Owe authorities will seek extradition or file charges against him. Anna werner, thanks. Coming up next, why middleaged, working class, white americans are dying younger. [joy bauer] two thirds of americans have digestive issues. Im joy bauer, and as a nutritionist i know probiotics can often help. But many probiotics do not survive your stomachs harsh environment. Digestive advantage is different. Its natural protein shell is tougher than your stomachs harsh environment, so it surivies a hundred times better than the leading probiotic, to get where you need it most. Get the digestive advantage, and enjoy living well. A study out today by princeton Economist Says that white, middleaged, workingclass americans are suffering in a changing economy. Theyre living shorter lives with a sharp increase in socalled deaths of despair. From suicide, drinking and drugs. Heres mark strassmann. Reporter tony roach and drew arnold work as mechanics in townville, south carolina. Neither finished high school, and neither has health insurance. I get sick. I pay in cash. Roach, now 48, smokes a pack a day. We are all getting older . True. Things go wrong . Yes. If something goes wrong you are going to wish you hadnt . Very good. Probably so. Y. Arnold is 25 with a Significant Health worry. I was diagnosed with a tumor in my head when i was 18. Reporter benign . Yes, sir, benign. Reporter still there . Treated with medication. Reporter pay out of pocket . Yes, sir. How expensive . 300 a month. Reporter the study of whites with minimal education, theyre dying younger than other middle americans. A trend driven by dwindling economic opportunities. John gaylor education brings opportunity. Opportunity in the area of employment, later, opportunity in the skills to overcome obstacles. Roach and arnold, both trump supporters, are keeping an eye on health care reform. You think it will get better . No matter who is no matter who is here. Everybody makes promises that they dont keep. Guys like you are are, have to learn to do without . Yeah. A lot of people like me. Less educated white people overwhelmingly supported President Trump. Scott, the studies researchers said proposed reforms to obama care with premiums rising for older folk seem perfectly designed to hurt the people who voted for him. Mike strassmann in the up state for us tonight. Mike, thank you. Well be right back. Im so frustrated. I just want to find a used car without getting ripped off. You could start your search at the allnew carfax. Com that might help. Show me the carfax. Now the car you want and the history you need are easy to find. Show me used trucks with one owner. Pretty cool. Show me the carfax. Start your used car search and get free carfax reports at the allnew carfax. Com. Im joy bauer, and as a nutritionist i know probiotics can often help. Try digestive advantage. It is tougher than your stomachs harsh environment, so it surivies a hundred times better than the leading probiotic. Get the digestive advantage. Today the Senate Judiciary committee wrapped up four days of hearings on Supreme Court nominee neil gorsuch. Democratic leader Chuck Schumer promised to filibuster. Today a federal agency ruled, President Trumps hotel at an historic former post Office Building in washington is not violating its lease. The lease prohibits government officials from profitting from the property. But the General Services administration says, there is no violation, because the president has transferred his businesses to his children, and will not get any money from the hotel. This man was told he would have a few weeks to live. Wait until you see how he lived the next few decades. We take some unexpected extra steps to raise healthy chickens with no antibiotics ever. Like putting oregano in their water. It has natural antioxidants and we dont have to use antibiotics in their diet. Perdue. Over 200 products no antibiotics ever. We take some unexpected extra steps to raise healthy chickens with no antibiotics ever. For example, thyme. Its part of our 100 veggie diet and helps support their immune system. Ducts no antibiotics ever. Many of you will be watching march madness here on cbs in a few minutes. To get you warmed up, jim axelrod brought us the story of one of the greatest come pelt tors you will ever meet. He is 42 and there is no mountain he cant climb. Reporter the kind of guy who could easily give the rest of us a complex. Every morning i wake up. I tell myself this is the best day ever. And you believe that . I believe it. Looking back on my life, how could i not. Right now, he is training for the trip next month to the north pole. Having climbed the highest mountain on each continent and trekked to the south pole this will be the last leg of what its known as the explorers grand slam. You never know what is possible until you actually are in that situation. To push yourself forward. How do you feel, buddy . How do you feel . What would be impressive for anyone becomes almost inconceivable when you realize sean swarner its a cancer survivor. How close were you to dying . I literally was on deaths door. Reporter twice as a teenager he was given weeks to live. But he fought back. The radiation that helped save his life ravaged his body. As if surviving cancer, not once, but twice, isnt enough. Functioning lung. I have one big bulldog lung over here apparently. Reporter so all that training, pulling tires up slopes, jeep around the neighborhood is done with one lung. So will the trek of more than 100 miles in minus 40 degree temperatures, pulling a sled with 200 pounds of supplies, behind him. People are limited by this. Not their bodies. If you dont think its possible, its not possible. Reporter at the north pole he will plant a flag with names of people battling cancer, arranged to spell out hope. Its not about me, my story, about people fighting for their lives. And people who need that hope. Reporter sean swarner often envisions of the end of the journey. Get to the north pole, collapse to my knees, cry like a baby. Then i think to myself, now what . Reporter if simply a matter of desire, hard to imagine anything he cant do. Jim axel rod, cbs news, new york. And thats the overnight news for this friday. For some of you, the news continues. For others check back with us a little bit later for the morning news, and cbs this morning. From the Broadcast Center in new york city, im scott pelley. Welcome to the overnight news. A memorial growing on Westminster Bridge in london, scene of wednesdays deadly terror attack. Three people were killed including a local Police Officer and dozens hurt when a man turned an suv into a tool of jihad. He was killed by police. The Islamic State claims the attacker was one of their soldiers. British police cant confirm that. But they do know who he was and have made several arrests. Elizabeth palmer has that. Reporter the man who left this trail of carnage in the heart of london no, no, no reporter was khalid massoud, 52, british born, shot by police during the attack. Overnight officers raided Properties Linked to massoud who was not currently under investigation for any links to violent extremism. Nonetheless, isis claimed today that he was a soldier of the Islamic State. He was also a terrorist who stabbed Policeman Keith Palmer to death and murdered asha frayed, a teacher and mother of two with his car along with american kurt cochran from utah, who was in london with his wife melissa for their wedding anniversary. She was injured yesterday. And is still in the hospital. The injured came from 11 countries. Among them, French High School students, south korean tourists and romanian architect, andrea christea, in this video, as the car barrels along the sidewalk she tumbles off the bridge into the icy river. A day ago the area was strewn with bodies. In the famous british spirit of keep calm and carry on. The british authorities are determined things should return to normal soon as possible. Less than 24 hours after the attack Westminster Bridge was open to traffic. In parliament, politicians observed a minute of silence and heard a toughminded message from Prime Minister theresa may. We are not afraid. Our resolve will never waiver in the face of terrorism. Tonight, thousands of londoners gathered in Trafalgar Square for a vigil led by the muslim mayor. In part they came to honor the dead. And in part to bolster solidarity among the living. Turns out taking the job as Donald TrumpsCampaign Manager may have been the worst decision, Paul Manifort ever made. Fbi, Treasury Department and news organizations continue to dig up evidence of his vladamir putins associates. The latest, a 10 Million Contract with the russian billionaire. And manafort its not the only friend of donald in the cross hairs of investigators. Jeff pegues reports. Reporter lawmakers getting closer to formalizing plans for Trump Associates to testify. At the top of the list are Paul Manifort and roger stone. Democrats in congress have long suspected that stone had advance knowledge of some of last years disclosures of Democratic Party emails. The u. S. Senate sent me a letter. Cbs news obtained the letter, roger stone mentioned to cbs this morning, earlier this week. The former Trump Campaign adviser and long time friend of President Trump has been asked to preserve emails and communications he may have had involving russian interests. Stone campaigned Foreign Policy adviser, carter page, former adviser, michael flynn, and former campaign chairman, Paul Manafort under scrutiny as the the fbi investigates whether there was collusion with russian operatives during the election. I dont know if it is true or not. If it is, it is concerning. Lawmakers wednesday reacted to a report by Associated Press that in 2806, manafort signed a 10 Million Contract with russian billionaire oleg deripaska, as manafort described it, lobbying and influencing news coverage. Dep dep deripaska has solid connections to putin. You have about 20 big business men in russia. Those are the oligarchies. Yes. And he is one of them. Manifort led the Trump Campaign in the leadup to the convention. This week, the Trump White House zwroun played its connection. Paul was hired, to count delegates. Why he was brought in. Reporter that its not the impression trumps family gave at the convention. We couldnt be more happy with the work he is doing, the way he is tackling these things, the way he is handling the organization of everything going forward. He has done a phenomenal job. Manafort acknowledges working with the man, but says he never worked for the russian government. He calls the allegations ate smear that is being used to paint a false picture. Part of the fbi counterintelligence investigation involves examining Financial Transactions to see where they may lead. The United Nations declared fam