The conversations McCabe cited took place in the wake of Trump’s move to fire FBI Director James B. Comey, a decision that continues to be a central focus of lawmakers investigating whether the president has obstructed the federal investigation of his campaign. The New York Times first reported last year that McCabe had made note of Rosenstein’s alleged proposal in a memo; Rosenstein denied that he had. Graham promised last month that his committee would also subpoena Rosenstein and McCabe if necessary.
The letter is Graham’s latest effort to pick up where House Republicans left off last year in their probe of top law enforcement officials and how they handled federal investigations into Trump’s alleged Russia ties and Hillary Clinton’s use of a private email server.
On the Senate floor Thursday, Graham also repeated his call for the Justice Department to appoint a second special counsel to look into FBI and Justice Department officials’ conduct and whether political bias affected decisions that were made in the course of those investigations.