Senate Judiciary Committee Chairman Lindsey Graham said he would invite special counsel Robert Mueller to testify as part of the Republican-led panel’s investigation into the origins and conduct of the Trump-Russia investigation.

“Apparently Mr. Mueller is willing — and also capable — of defending the Mueller investigation through an oped in the Washington Post,” the South Carolina Republican tweeted on Sunday. “Democrats on the Senate Judiciary Committee have previously requested Mr. Mueller appear before the Senate Judiciary Committee to testify about his investigation. That request will be granted.”