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

Sen. Lindsey GrahamLindsey Olin GrahamSchumer to GOP: Cancel 'conspiracy hearings' on origins of Russia probe Graham announces hearing on police use of force after George Floyd killing In a new cold war with China, America may need to befriend Russia 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 John TrumpMichael Flynn transcripts reveal plenty except crime or collusion 50 people arrested in Minneapolis as hundreds more National Guard troops deployed Missouri state lawmaker sparks backlash by tweeting 'looters deserve to be shot' MORE's top targets.

“I'll make a prediction: There will be 51 Republican votes to call Hunter Biden, Joe BidenJoe BidenTrump campaign launches Asian Pacific Americans coalition Biden: 'More than one African American woman' being considered for VP Liberal group asks Klobuchar to remove herself from VP consideration because of prosecutorial record MORE, the whistleblower and the DNC staffer at a minimum,” Graham told reporters.

His comments come as former national security adviser John BoltonJohn BoltonHave the courage to recognize Taiwan McConnell says Obama administration 'did leave behind' pandemic plan Trump company lawyer warned Michael Cohen not to write 'tell-all' book: report 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 Mulvaney12 things to know today about coronavirus Mulvaney: 'We've overreacted a little bit' to coronavirus The Memo: Trump agenda rolls on amid pandemic MORE.

Updated: 1:23 p.m.