Republican senators on Monday said that they expect a crucial vote on whether to allow witnesses in the impeachment trial to take place on Friday.
“We’re going to get to the specific question of witnesses on Friday,” Sen. Mike Braun (R-Ind.) told reporters.
Sen. John Thune (S.D.), the No. 2 Senate Republican, also said that the vote would “presumably” take place on Friday.
“It probably happens Friday or Saturday at the latest,” Thune added.
The upcoming witness vote comes as The New York Times reported on Sunday night that former national security adviser John Bolton’s forthcoming memoir will say that Trump tied aid to Ukraine to the country helping with investigations into Democrats, including former Vice President Biden and his son Hunter Biden.
The report has injected uncertainty into whether the Senate will call witnesses.
Democrats have requested four witnesses in the impeachment trial, including Bolton. GOP leadership had appeared confident as of last week that the effort would fall short, paving the way for Trump’s quick acquittal.
But Sen. Mitt Romney (R-Utah) said it was “increasingly likely” more Republican senators would support calling Bolton. He clarified later that his comments were not based on conversations with colleagues.
Sen. Susan Collins (R-Maine) added that she thought Bolton’s allegations “strengthen the case” for witnesses, but she is waiting to make a decision until after opening arguments and questions from senators.
Every GOP senator, including Romney and Collins, voted against an effort to subpoena Bolton as part of the rules resolution that passed last week.