Sen. James Lankford James Paul LankfordMcConnell works to lock down GOP votes for coronavirus bill Charities scramble to plug revenue holes during pandemic Warren calls for Postal Service board members to fire DeJoy or resign MORE (R-Okla.) is calling for the White House to hand over a copy of 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's forthcoming memoir.

“I am encouraging the White House, anybody that I can talk to, to say: That manuscript is pertinent and we should get access to that manuscript to see what they’re actually saying,” Lankford said in a Facebook video posted on Monday night.

The New York Times reported on Sunday night that Bolton, in his forthcoming memoir, will claim that Trump tied aid for Ukraine to the country helping 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.

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Bolton's claim has upended what was expected to be a smooth path to Trump's acquittal in his Senate impeachment trial, with GOP leadership predicting, before the Times report, that they would be able to block efforts to open the door to new witnesses. That vote is expected later this week.

Lankford did not indicate that he wants Bolton to testify, but noted that there are "plenty of microphones all over the country that he should step forward and start talking about it right now.”

Democrats would need four Republicans to vote with them to allow witnesses. If they overcome that initial hurdle, both sides are expected to make motions for specific individuals and the Senate would then vote on them.

Lankford's call for the manuscript comes after Sen. Lindsey Graham Lindsey Olin GrahamMomentum growing among Republicans for Supreme Court vote before Election Day Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Warning signs flash for Lindsey Graham in South Carolina MORE (R-S.C.) also publicly urged the White House to send over the manuscript, arguing that senators should be able to "evaluate" it.

"I think what we have to do here is evaluate the manuscript. ... I want to know what's in the manuscript," Graham said.