Mitt Romney told reporters Monday morning that he thinks new revelations from former Trump national security adviser John Bolton will increase the number of Republican senators who will vote in favor of calling at least Bolton to testify in the Senate impeachment trial.

"I think it’s increasingly likely that other Republicans will join those of us who think we should hear from John Bolton. Whether there are other witnesses and documents, that’s another matter,” Romney, a Republican senator from Utah, said in the Capitol.

Romney, asked if he was making this comment based on conversations with other senators, said he had “spoken with others who have opined on this as well.”

"I think the story that came out yesterday, it’s increasingly apparent that it would be important to hear from John Bolton,” Romney said.

Sen. Mitt Romney and John Bolton. (Photo illustration: Yahoo News; photos: AP, Patrick Semansky/AP)

The New York Times reported Sunday evening that Bolton’s new book, due out in March, includes a firsthand account of Trump telling him he was holding back nearly $400 million in military and nonmilitary assistance to Ukraine until the government there announced investigations into Joe Biden and the 2016 election.

Sen. Susan Collins, R-Maine, tweeted, “The reports about John Bolton’s book strengthen the case for witnesses and have prompted a number of conversations among my colleagues.”

Even one of the president’s staunchest defenders, Sen. Lindsey Graham, R-S.C., indicated that momentum was building toward calling Bolton and potentially other witnesses whose testimony Democrats have been demanding.

"If there is a desire and decision by the Senate to call Democratic witnesses, then at a minimum the Senate should allow President @realDonaldTrump to call all relevant witnesses he has requested,” Graham tweeted.

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