After Deputy Attorney General Rod Rosenstein appointed former FBI Director Robert Mueller to the position of special counsel in the investigation surrounding Russian efforts to influence the 2016 presidential election, Chaffetz said that Mueller was a "great selection" with "impeccable credentials".
In the meantime, Republicans and Democrats on the Senate Judiciary Committee said Wednesday they also expect to ask ousted FBI Director James Comey to testify to Congress. In the other letter, the committee asked McCabe for "any notes or memorandum" Comey prepared about any communications he had with senior White House or Department of Justice officials about Russia-related investigations.
Republican Senate Intelligence Committee Chairman Richard Burr on Tuesday said the burden on proof is on the New York Times, which first reported the Comey memo, to publish it. The conversation took place after the FBI launched its investigation into ties between Russian Federation and Trump and his advisers.
Comey has not yet confirmed if he will attend the hearing. "If it's just to go on to a different job, a more lucrative job, that will be very offensive to me" as well as to other lawmakers.
Chaffetz, R-Utah, said Wednesday afternoon that he had yet to issue the invitation because Comey "evidently has a new (number)". The Intelligence Committee also invited Comey to testify both publicly and behind closed doors about the reported conversations with President Trump.More news: Trump willing to use engagement on North Korea crisis: South Korea envoy
Chaffetz said he nonetheless thought that Comey's firing should be investigated.
Republicans, meanwhile, have continued asking questions about the FBI's investigation into Hillary Clinton's use of a private email server previous year.
The Judiciary Committee letter to the White House mentioned the Times article, saying "the article alleged that Mr. Comey had memorialized a conversation with the President in which the President made statements that have been interpreted as asking the Federal Bureau of Investigation to clear Mr. Flynn of alleged wrongdoing". The article noted that Mr. Comey was known among his closet advisers to document conversations that he believed would later be called into question.
"If we need to subpoena them we will, but we do need to see the full content of these materials and then also talk to Director Comey".
Grassley and Feinstein asked for the information by next Wednesday. Lindsey Graham, R-South Carolina and Sheldon Whitehouse, D-Rhode Island, who lead Judiciary's subcommittee on crime and terrorism.