Sen. Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-S.C.) said on Wednesday that House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE (D-Calif.) should be a witness in the Senate's impeachment trial.

Graham was asked during an interview with Fox News'sif senators would try to call Schiff, his staff, the whistleblower or Hunter Biden as part of an impeachment trial.

"As a matter of oversight, I'm not going to call a House member, but if you impeach the president of the United States, I want to find out if in fact Schiff and his staff met with the whistleblower," Graham said.

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"So if there's a trial in the Senate, one of the witnesses will be Adam Schiff because if he in fact did meet with the whistleblower and coach the guy up, I think that's relevant to the impeachment inquiry itself," Graham continued.

When Jordan said Schiff was the only member of Congress who knew the whistleblower's identity, Schiff responded , "As the gentleman knows, that's a false statement. I do not know the identity of the whistleblower."

A spokesman for Schiff didn't immediately respond to a request for comment.

Senate leadership has given no indication about who it may or may not allow to be called as witnesses as part of a likely Senate impeachment trial.

The Senate passed a resolution 100-0 during the Clinton impeachment trial that established the procedure for filing motions, how long senators would have to ask questions and the way witnesses would be called.

But a second resolution specifying which individuals would be called as witnesses faltered along party lines.

A source familiar with the whistleblower's contacts told Reuters on Wednesday that the whistleblower never spoke or met with Schiff.

Republicans first homed in on Schiff in the wake of a New York Times story earlier this year reporting that the whistleblower reached out to him before going to the intelligence community's inspector general.