Sen. Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE (R-S.C.) is threatening to subpoena former FBI Director James Comey after it was revealed that he drafted a statement recommending against prosecuting Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE weeks before interviewing her as part of the FBI's probe into her use of a private email server while secretary of State.

Asked on Fox News's "Happening Now" about whether he would subpoena Comey, who was abruptly fired in May, Graham said: "I would, yes."

"He’s coming one way or the other if I have anything to do about it," said Graham, the chairman of the Senate Judiciary Committee Subcommittee on Crime and Terrorism.

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Comey took the unusual step of recommending against criminal charges for Clinton in July 2016, after concluding his agency's investigation into her use of a private email server during her tenure as secretary of State.

Clinton, he said, had been "extremely careless" in her private email use. But that behavior was not criminal and didn't warrant prosecution, he added.

But partial transcripts of interviews with FBI officials released late last month by Graham and Sen. Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE (R-Iowa), the chairman of the Judiciary Committee, suggest that Comey contemplated a statement clearing Clinton in April or May of 2016, before agents had interviewed the then-Democratic presidential candidate.

Comey has said that he decided to make the public statement closing the Clinton case in part because of former Attorney General Loretta Lynch's meeting with former President Bill Clinton William (Bill) Jefferson ClintonDolly Parton remembers Ginsburg: 'Her voice was soft but her message rang loud' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Calls grow for Biden to expand election map in final sprint MORE on a Phoenix, Ariz., tarmac last year.

That Comey may have drafted his statement months before recommending against charges for Clinton has prompted GOP lawmakers to call for the former FBI director to meet again with congressional investigators.

"The real reason was not the tarmac meeting," Graham said Thursday. "I can’t make sense of this. I’m very suspicious of the timing; I’m very suspicious of the reason."