Former Sen. Byron Dorgan (D-N.D.) blasted Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellHawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE’s (R-Ky.) suggestion that he would coordinate with the White House on President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE’s upcoming impeachment trial, calling it “unfathomable” in an interview Saturday with MSNBC’s Joy Ann Reid.

“I sat in the last Senate trial 20 years ago, what Sen. McConnell did is just unfathomable to me, it’s just monumentally wrong,” Dorgan said.

“To announce that I’m going to take an oath to be impartial, but I’ve already told the American people that I’m not impartial… that I’m going to be the foreman of the jury in effect, and that I’m going to be on the side of the defendant to get acquittal. That is not the right thing to do, and it gives the American people very little confidence in what’s going to happen in the Senate,” he continued.

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McConnell has not yet committed to a timeline or witnesses for the impeachment trial, telling Fox News Radio “Obviously, I think we've heard enough. After we've heard the arguments, we ought to vote and move on.”

Earlier in December, the Senate majority leader told reporters “I’m not an impartial juror. This is a political process … I’m not impartial at all.”

“Everything I do during this, I’m coordinating with the White House counsel,” he later told Sean Hannity Sean Patrick HannityWill Chis Wallace's debate topics favor Biden over Trump? Former Florida attorney general calls Kyle Rittenhouse 'a little boy out there trying to protect his community' Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE. “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.”

President Trump was impeached in the House earlier this month on two counts: abuse of power and obstruction of Congress.

Impeachment proceedings began when a whistleblower filed an anonymous complaint to Congress, alleging that the president withheld aid from Ukraine in exchange for an investigation into former Vice President Joe Biden on a July 25 call with the country’s President, Volodymyr Zelensky.