This is immediate grounds for Mitch’s disqualification:
The impeachment oath for Senators: According to Rule XXV of the Senate Rules in Impeachment Trials, all senators must make the following oath: “I solemnly swear [or affirm, as the case may be] that in all things appertaining to the trial of the impeachment of [the person being impeached], now pending, I will do impartial justice according to the Constitution and laws: So help me God.”
One constitutional scholar notes — “the Constitution asks them to remember that they are not sitting as senators, but now as judges and jurors.”
In recent days, McConnell indicated that he has held discussions with the White House to formulate an impeachment game plan to achieve a favorable outcome for Trump. “Everything I do during this, I’m coordinating with the White House counsel,” the senator told Fox News host Sean Hannity late last week. “There will be no difference between the president’s position and our position as to how to handle this.” The Republican also revealed that he will be working in “total coordination with the White House counsel’s office and the people representing the president in the well of the Senate.”
“I’m not an impartial juror. This is a political process,” McConnell told reporters Tuesday while fielding questions about the upcoming trial.