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But Graham — who told reporters this week that he wasn't reading transcripts of inquiry depositions — dismissed Schiff.

"That statement is full of crap," Graham said.

Graham, who has emerged as one of Trump's loudest allies in the Senate, has repeatedly lashed out at House Democrats and Schiff, in particular, including offering a resolution backed by 49 other GOP senators formally condemning the House process.

However, Graham said during the Fox News interview that he would not try to call Schiff before the Senate Judiciary Committee to question him about the House proceeding. Graham has noted in recent weeks that he's facing pressure from the conservative base to try to force Schiff to testify.

"I'm not going to subpoena a member of the House," Graham said Wednesday. "If they subpoenaed me, I wouldn't go. We have separate branches of government."

But Graham on Wednesday indicated that Giuliani was unlikely to testify.

"I invited him, and he hasn't responded," he said. "He's the president's lawyer, so I doubt we could actually get him to come unless he volunteered to come."

Instead, Graham is calling for the Senate Foreign Relations Committee to investigate Ukraine and Biden, including calling State Department officials.