The move by Bryan Pagliano, who had worked on Clinton’s 2008 presidential campaign before setting up the server in her New York home in 2009, came in a Monday letter from his lawyer to the House panel investigating the 2012 attack on the U.S. consulate in Benghazi, Libya.

The letter cited the ongoing FBI inquiry into the security of Clinton’s e-mail system, and it quoted a Supreme Court ruling in which justices described the Fifth Amendment as protecting “innocent men . . . ‘who otherwise might be ensnared by ambiguous circumstances.’ ”…

Two other Senate committees have contacted Pagliano in the past week, according to a copy of the letter, which was obtained by The Washington Post. The requests came from the Senate Judiciary Committee and the Homeland Security Committee, according to people familiar with the requests.