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Republican Sen. Lindsey Graham, one of President Trump’s biggest allies, is now calling on the President’s personal lawyer Rudy Giuliani to testify.

Graham wants Giuliani to come before the Senate Judiciary Committee he chairs, and before the Senate trial on impeachment.

"I’m going to be reaching out to Rudy, writing a letter saying you’re welcome to come to this committee, if you have something you’d like to share about corruption," Graham said.

When asked whether Giuliani should be compelled to come or testify, Graham said Giuliani’s attendance “would be up to him.”

Giuliani recently returned from Ukraine, where he said he was actively investigating whether Ukraine had interfered in the 2016 US elections, and the role of Former Vice President Joe Biden and his son Hunter Biden in corrupt activities.

There is no evidence supporting Giuliani’s investigations, but he and Trump insist they have a case.