Meanwhile, Senate Democrats are seeking high-level witnesses and documents as part of a potential Senate trial.

“Will we fulfill our duty to conduct a fair impeachment trial of the president of the United States or will we not? That is the most pressing question facing this Senate,” Senate Minority Leader Chuck Schumer said last week. “The country just saw McConnell’s answer to that question. The answer is no.”

Schumer argued that McConnell is ignoring “the only one precedent that matters here.”

“Never, never in the history of our country has there been an impeachment trial in which the Senate was denied the ability to hear from witnesses, yet the Republican leader seems intent on violating that precedent and denying critical evidence to this body and to the American people,” Schumer said, adding that McConnell has “no intention to be impartial.”

One of those highly sought-after witnesses is former National Security Adviser John Bolton, who said in a statement Monday that he would testify in a potential impeachment trial should he be subpoenaed by the Senate.