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

Sen. Lindsey GrahamLindsey Olin GrahamProgressives rave over Harrison's start at DNC Senate confirms Garland's successor to appeals court Progressives want to tighten screws beyond Manchin and Sinema 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 TrumpKushner lands book deal, slated for release in 2022 Biden moves to undo Trump trade legacy with EU deal Progressives rave over Harrison's start at DNC MORE's top targets.

“I'll make a prediction: There will be 51 Republican votes to call Hunter Biden, Joe BidenJoe BidenMellman: Trump voters cling to 2020 tale FDA authorizes another batch of J&J vaccine Cotton warns of China collecting athletes' DNA at 2022 Olympics MORE, the whistleblower and the DNC staffer at a minimum,” Graham told reporters.

His comments come as former national security adviser John BoltonJohn BoltonJohn Bolton: Biden-Putin meeting 'premature' Republicans request documents on Kerry's security clearance process Trump pushes back on Bolton poll 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 MulvaneyHeadhunters having hard time finding jobs for former Trump officials: report Trump holdovers are denying Social Security benefits to the hardest working Americans Mulvaney calls Trump's comments on Capitol riot 'manifestly false' MORE.

Updated: 1:23 p.m.