At an event in Sarasota, Fla., on Monday, former White House chief of staff John Kelly John Francis KellyMORE said he believes the accounts detailed in former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE’s memoir.

“If John Bolton says that in the book, I believe John Bolton,” Kelly said at the event, according to the Sarasota Herald-Tribune. “Every single time I was with him ... he always gave the president the unvarnished truth” he said.

“So, I think if there are people that could contribute to this, either innocence or guilt ... I think they should be heard,” Kelly said at the Florida event. “I think some of the conversations seem to me to be very inappropriate, but I wasn’t there. But there are people that were there that ought to be heard from” the former military general continued.

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Kelly's comments come after The New York Times obtained a manuscript of Bolton's unpublished memoir Sunday. In the manuscript the former national security adviser reportedly claims President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE personally told him he wanted to withhold about $400 million in military aid to Ukraine until it investigated the president's political rivals, including former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE and his son, Hunter Biden.

Trump's dealings with Ukraine are at the center of his current impeachment trial in the Senate.

The new revelation from Bolton raises questions about whether new witnesses will be called to give testimony in the coming proceedings.

Since the Times reported the contents of the manuscript, more pressure has been on key moderate Republicans to vote for witnesses in the Senate impeachment trial.

Sen. Mitt Romney Willard (Mitt) Mitt RomneyMomentum growing among Republicans for Supreme Court vote before Election Day Toobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote The Memo: Court battle explodes across tense election landscape MORE (R-Utah) told reporters on Monday that it’s “increasingly likely” the Senate will vote to bring in witnesses. However, Rep. Mark Meadows Mark Randall MeadowsTrump reacts to Ginsburg's death: 'An amazing woman who led an amazing life' Trump carries on with rally, unaware of Ginsburg's death United Airlines, unions call for six-month extension of government aid MORE (R-N.C.), a close ally of the president, said members who vote for witnesses could "face political repercussions," while other GOP senators have said it’s appropriate for members to get a copy of the manuscript.

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Kelly was White House chief of staff until January 2019, and was later replaced by former Office of Management and Budget Director Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE, who is on the list of people Democrats would like to see testify before the Senate.

Trump was impeached on two charges: abuse of power and obstruction of Congress.

The Senate trial is in its seventh day of proceedings. Tuesday is the last day that Trump's defense team has to present their opening arguments.