Senate Minority Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.) on Monday said that a New York Times report on allegations made by former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE in his upcoming memoir "essentially confirms" the first article of impeachment against President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE.

"This is stunning. It goes right to the heart of the charges against the president," Schumer told reporters. "Ambassador Bolton essentially confirms the president committed the offenses charged in the first article of impeachment.”

Schumer's remarks come after the Times reported on Sunday night that Bolton claims in his forthcoming memoir that President Trump tied Ukraine aid to help with investigations into Democrats, including former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and his son Hunter Biden.

ADVERTISEMENT

The report has upended the debate on Capitol Hill days ahead of an up-or-down vote on whether or not to allow new witnesses. Democrats will need four Republican senators to vote with them to successfully pave the way for witnesses.

If they are successful, both sides would be expected to make motions for specific individuals, and the Senate would have to vote on each individual moton.

"How can Senate Republicans not vote to call that witness, and request his documents," Schumer asked.

"How can Senate Republicans not vote to call that witness and request those documents? We’re all staring a White House cover-up in the face," Schumer continued.

Sen. Mitt Romney Willard (Mitt) Mitt RomneyMomentum growing among Republicans for Supreme Court vote before Election Day Toobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote The Memo: Court battle explodes across tense election landscape MORE (R-Utah) on Monday said he thought it was "increasingly likely" that other Republicans will support calling Bolton. But Romney stressed that he would not make a final decision on witnesses until after opening arguments and questions from senators.

ADVERTISEMENT

Sen. Susan Collins Susan Margaret CollinsJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally Momentum growing among Republicans for Supreme Court vote before Election Day MORE (R-Maine) added in a statement that Bolton's allegations "strengthen the case" for witnesses.

"The reports about John Bolton's book strengthen the case for witness and have prompted a number of conversations among my colleagues," Collins said in a statement.

A group of GOP senators, including Romney and Collins, worked to get the language in the rules resolution that guaranteed a midtrial vote on whether or not witnesses would be allowed.