Senate Republicans will hold a special meeting Tuesday afternoon after 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’s legal team finishes its opening arguments to hash out their strategy on how to handle the tricky question of subpoenaing additional witnesses and documents.

Two Senate Republican sources confirmed that Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum 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 (R-Ky.) has called the meeting to get his GOP colleagues on the same page as phase one of the impeachment trial nears its end.

Under the trial’s organizing resolution, which McConnell drafted, senators will have 16 hours to ask questions of the House managers and the president’s lawyers before voting on whether it should be in order to subpoena additional witnesses, such as 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 and acting White House chief of staff Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE.

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Senate Republicans have come under increased pressure to call for Bolton’s testimony after The New York Times reported Sunday that Bolton's unpublished book manuscript claims Trump said he wanted to freeze military aid for Ukraine until officials there announced an investigation of former Vice President Joe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.

Two moderate Republicans, Sens. 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 (Utah) and 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 (Maine), said Monday that news of Bolton’s draft book strengthened the case to agree to additional witnesses and testimony.

Romney said “it’s increasingly likely that other Republicans will join those of us who think we should hear from John Bolton.”

McConnell was able to keep his other GOP colleagues in line Monday when he urged them to hold off on deciding the question of witnesses until after the president’s lawyers had finished their opening arguments and senators had time to ask questions.

Now that the White House is close to finishing its opening presentation, McConnell is checking back in with colleagues to discuss the next steps of the trial.

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Several GOP senators have floated proposals to allow them to review Bolton’s claims without voting to issue new subpoenas, which could prolong the trial past the Feb. 4 State of the Union address and perhaps for weeks beyond.

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 in talks with the White House to make Bolton’s manuscript available for senators to review at the Sensitive Compartment Information Facility (SCIF) in the Capitol Visitor Center.

Senate Homeland Security Committee Chairman Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill Second GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (R-Wis.) on Monday suggested that Bolton reveal what he knows to the media.

“Now that what has unfolded with the manuscript being leaked — by the way, exquisite timing, maybe suspicious timing — The Wall Street Journal has called for John to just come forward. Just tell the public what you know. I think that would actually be a smart thing. I’d encourage John to do that,” Johnson told reporters.

Johnson said Bolton should do so “without involving the trial” and possibly go straight to the media.

Sen. Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (R-Pa.) has proposed a one-for-one witness swap, under which Republicans would agree to hear Bolton’s testimony in exchange for subpoenaing Hunter Biden, the former vice president’s son, to hear about his business dealings in Ukraine.