U.S. House impeachment managers criticized the Senate Republicans for their impeachment trial schedule saying it’s part of their effort to cover for President Donald Trump.

In a press conference Tuesday, House Judiciary Committee Chairman Jerrold Nadler (D-NY) said the Senate Majority Leader’s decision to allow debate over whether to hear from new witnesses is a textbook example of that ‘cover-up.’

“To be debating whether you should have the evidence admitted, to be debating whether you should allow witnesses is to be debating whether you should have a cover-up by definition,” said Nadler. “There’s no other way to look at it.There’s no other way to look at it. It doesn’t matter how it was done some time ago. It was done very fairly as it happens some time ago, but it doesn’t matter. It cannot be used as an excuse.”

House Republicans tried to have a debate over witnesses during impeachment proceedings. Democrats shut down that debate. That’s the cover up, Andy Biggs

He continued, “The only reason to oppose bringing a witness is to cover up because you’re afraid of what the witness will say. The question for the Senate is do the Republican Senators want to be complicit in the cover up of the President.”

Rep. Andy Biggs (R-AZ) slammed Nadler’s assessment on Twitter Tuesday.

“The hypocrisy from the House Managers is unreal. Jerry Nadler just said that even having a debate over witnesses is a cover-up attempt,” Biggs wrote. “House Republicans tried to have a debate over witnesses during impeachment proceedings. Democrats shut down that debate. That’s the cover up.”

The hypocrisy from the House Managers is unreal. Jerry Nadler just said that even having a debate over witnesses is a cover-up attempt. House Republicans tried to have a debate over witnesses during impeachment proceedings. Democrats shut down that debate. That's the cover up. — Rep Andy Biggs (@RepAndyBiggsAZ) January 21, 2020

Senate Majority Leader Mitch McConnell’s impeachment timeline released Mondaywill allow each side two days with twelve hours each day to present opening statements. Senators will have sixteen hours for written questions with four hours of debate time.

The decision to call other witnesses will then be made. Finally, the Senate will vote on the impeachment articles.