WASHINGTON – Special counsel Robert Mueller is examining a previously undisclosed meeting between longtime Donald Trump confidante Roger Stone and a Russian figure who allegedly tried to sell him dirt on Hillary Clinton. The meeting between Stone and a man who identified himself as Henry Greenberg was described in a pair of letters sent Friday to the House Intelligence Committee and first reported by The Washington Post. Stone and Michael Caputo, a Trump campaign aide who arranged the 2016 meeting, did not disclose the contact in their interviews with the committee.