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Graham: There will be 51 GOP votes to call Bidens, whistleblower

Sen. Lindsey GrahamLindsey Olin GrahamPassage of the John Lewis Voting Rights Advancement Act is the first step to heal our democracy Progressive support builds for expanding lower courts McConnell backs Garland for attorney general MORE (R-S.C.) predicted on Tuesday that if the Senate opens the door to calling new witnesses, Republicans will vote to subpoena President TrumpDonald TrumpSenators given no timeline on removal of National Guard, Capitol fence Democratic fury with GOP explodes in House Georgia secretary of state withholds support for 'reactionary' GOP voting bills MORE's top targets.

“I'll make a prediction: There will be 51 Republican votes to call Hunter Biden, Joe BidenJoe BidenKlain on Manchin's objection to Neera Tanden: He 'doesn't answer to us at the White House' Senators given no timeline on removal of National Guard, Capitol fence Overnight Defense: New Senate Armed Services chairman talks Pentagon policy nominee, Afghanistan, more | Biden reads report on Khashoggi killing | Austin stresses vaccine safety in new video MORE, the whistleblower and the DNC staffer at a minimum,” Graham told reporters.

His comments come as former national security adviser John BoltonJohn BoltonTrump offered North Korea's Kim a ride home on Air Force One: report Key impeachment figure Pence sticks to sidelines Bolton lawyer: Trump impeachment trial is constitutional MORE’s claim in his forthcoming memoir that President Trump tied Ukraine aid to the country opening up investigations into former Vice President Joe Biden and his son Hunter Biden.

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GOP leadership had hoped to end the trial with no witnesses, but Bolton's accusation, reported by The New York Times, has thrown the ability of the caucus to quickly end the trial into question. 

Conservatives are warning that if four Republican senators side with Democrats to call Bolton, then Trump's legal team should get as many witnesses. Since Democrats would not support calling the Bidens or the whistleblower, Republicans would have to provide the 51 votes from their 53 members. 

The Senate is expected to vote Friday on whether to call witnesses. If 51 senators support calling witnesses, that would open the door to both sides making motions for specific individuals. The Senate would then vote on those specific individuals. 

Democrats have said they want to subpoena four individuals, including Bolton and acting chief of staff Mick MulvaneyMick MulvaneyOMB nominee gets hearing on Feb. 9 Republicans now 'shocked, shocked' that there's a deficit Financial firms brace for Biden's consumer agency chief MORE.

Updated: 1:23 p.m.