Graham has been investigating the origins of the FBI’s “Crossfire Hurricane” probe – which looked into whether members of President Donald Trump’s 2016 campaign coordinated with Russian operatives to swing the election.

“The day of reckoning is upon us when it comes to Crossfire Hurricane,” Graham said during an appearance on Fox News on Wednesday night. He noted that Comey will appear before his committee on September 30.

He continued, “I appreciate Mr. Comey coming before the committee, and he will be respectfully treated but asked hard questions. We are negotiating with [former Deputy FBI Director Andrew] McCabe; we are hoping to get him without a subpoena — time will tell.”