The core principle behind the rule of law is that justice is blind and partisan identity should not influence a trial’s outcome. But anyone watching Mr. McConnell twist himself into knots in trying to block witnesses and documents has to wonder whether this notion ever took root in his mind. He has gone so far as to say that “there will be no difference between the president’s position and our position as to how to handle this to the extent that we can.” He also said, “There’s no chance the president is going to be removed from office.”

How can Mr. McConnell make such a claim without having heard from Mr. Bolton? Remember that the diplomat Fiona Hill testified at the House impeachment hearings that Mr. Bolton called the pressuring of Ukraine by the administration a “drug deal” and said he wanted no part of it. Mr. Bolton himself has said that he possesses new information that has not been revealed. He even gave a speech saying that some of Mr. Trump’s foreign policy decisions were made in his self-interest, not in the interest of the American people. Particularly after the United States’ killing of Maj. Gen. Qassim Suleimani of Iran, such questions have arisen once again.

And how can Mr. McConnell make such a claim without having heard from the most important witness of all, Mr. Trump?