The Senate is not scheduled to be in session until Jan. 19, which could be McConnell's last day as Senate leader. Once Vice President Kamala Harris is sworn in, making her the president of the Senate, and Georgia's two Democratic senators are also sworn in, Senate Democratic leader Chuck Schumer will take charge and determine how the trial will proceed.

McConnell said he will not bring the Senate back on an emergency basis to start the trial, so the earliest it could begin would be Tuesday. That means the trial is certain to take place after Trump has already left office.

McConnell noted that the three previous Senate trials lasted “83 days, 37 days, and 21 days respectively.”