On April 30, Nixon asked for the resignation of Haldeman and Ehrlichman, two of his most influential aides. They were both later indicted, convicted, and ultimately sentenced to prison. He asked for the resignation of Attorney General Kleindienst, to ensure no one could claim that his innocent friendship with Haldeman and Ehrlichman could be construed as a conflict. He fired White House Counsel John Dean, who went on to testify before the Senate Watergate Committee and said that he believed and suspected the conversations in the Oval Office were being taped. This information became the bombshell that helped force Richard Nixon to resign rather than be impeached.