FILE - In this Sept. 26, 2017, file photo, longtime Donald Trump associate Roger Stone arrives to testify before the House Intelligence Committee, on Capitol Hill in Washington. Special Counsel Robert Mueller is examining previously undisclosed contact between former Trump campaign officials and a Russian figure alleged to have tried to sell them dirt on Hillary Clinton during the 2016 campaign. But Stone and Michael Caputo say they believe the man was an FBI informant trying to set them up. He denied that to the Washington Post. (AP Photo/J. Scott Applewhite, File)