On Wednesday, the House of Representatives voted to impeach President Trump. That means that sometime early in the new year, I will take an oath on the Senate floor to uphold the Constitution, review evidence and follow the facts wherever they lead, regardless of party or ideology. Every one of my colleagues will be required to do the same.

As a former prosecutor, I understand the importance of holding powerful people accountable. I know that every trial requires fairness and truth. Having worked my whole life serving the people, I know that any trial that abandons the pursuit of truth cannot be considered fair or just.

But the Senate majority leader, Mitch McConnell, appears more interested in covering up the president’s misconduct than in pursuing truth and fairness. He is already trying to limit the impeachment trial by preventing witnesses from testifying, and he has all but announced a verdict. In doing so, he showed the American people that he has no intention of honoring his oath.