Senator Lindsey Graham, the chairman of the Senate Judiciary Committee, vowed on Sunday to investigate whether the top officials at the Justice Department and the F.B.I. plotted an “attempted bureaucratic coup” to remove President Trump from office, and said he would subpoena the former F.B.I. director and the deputy attorney general if necessary.Mr. Graham, Republican of South Carolina, was reacting to an interview in which the former F.B.I. deputy director, Andrew G. McCabe, confirmed an earlier New York Times report that the deputy attorney general, Rod J. Rosenstein, had suggested wearing a wire in meetings with Mr. Trump and that Justice Department officials had discussed recruiting cabinet members to invoke the 25th Amendment to remove Mr. Trump from office.
Mr. Rosenstein has disputed the account.
“I think everybody in the country needs to know if it happened,” Mr. Graham said on the CBS program “Face the Nation,” calling Mr. McCabe’s assertion “beyond stunning.” He added: “I’m going to do everything I can to get to the bottom of Department of Justice, F.B.I. behavior toward President Trump and his campaign.”
Asked by the program’s host, Margaret Brennan, if he would subpoena Mr. McCabe and Mr. Rosenstein to testify, Mr. Graham said, “How can I not if that’s what it takes?” He promised to have a hearing to find out “who’s telling the truth.”