"Senators should insist that Mr. Bolton be called as a witness, and provide his notes and other relevant documents," the House impeachment managers said in a joint statement Sunday after The New York Times reported the details from Bolton's manuscript. "The Senate trial must seek the full truth and Mr. Bolton has vital information to provide."
Bolton could have additional evidence in his possession as well.
"He is known to be a voracious note taker," said a Democratic aide working on the impeachment trial, and may have a "contemporaneous account" of his conversations with Trump on Ukraine.
Unlike some who testified during House impeachment hearings, Bolton is a Republican establishment figure with government service dating back to President Ronald Reagan's administration. His hawkish views and sharp elbows in bureaucratic battles made him controversial, but he's respected by many high-profile Republicans.
Romney called Bolton a "brilliant man" when Trump fired him in September after disputes over the president's policy in Syria, North Korea and other parts of the world.
McConnell also praised Bolton at the time.
"I always appreciated John's candor and clear advice," he said.
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