“Senate Minority Leader Chuck Schumer proposed calling former national security adviser John Bolton and acting White House chief of staff Mick Mulvaney as witnesses at an impeachment trial for President Trump in a letter to Senate Majority Leader Mitch McConnell on Sunday,” NBC News reports.

“The offer is intended as a signal that Democrats are seeking an evidentiary trial, not intending to simply rely on the House investigation.”

Axios: “The Senate Democratic leader’s request — particularly his call for additional impeachment witnesses — may appeal to some moderate Republicans but is sure to meet forceful resistance from President Trump and McConnell.”

House Judiciary Committee Chairman Jerrold Nadler accused Senate Republicans of violating their oath to be impartial jurors in an impeachment trial, as GOP senators defended their right to work for President Trump’s acquittal, the Washington Post reports.

Said Nadler: “That’s in violation of the oath that they’re about to take, and it’s a complete subversion of the constitutional scheme.”

“House Intelligence Committee Chairman Adam Schiff said he would like for some witnesses to be called during the expected Senate impeachment trial against President Trump and for withheld administration documents to be introduced as evidence,” CNN reports.

Said Schiff: “I think there are any number of witnesses that should be called in the Senate trial, and many witnesses the American people would like to hear from that the administration has refused to make available. And perhaps of equal and if not greater importance are the thousands and thousands of documents that the administration refuses to turn over. I would hope that every senator of both parties would like to see the documentary evidence.”

“Sen. Lindsey Graham (R-SC) is inviting Rudy Giuliani, President Trump’s personal lawyer, to testify before the Senate Judiciary Committee about his recent trip to Ukraine,” The Hill reports.