A book manuscript by Bolton reportedly claims Trump personally told him last August that he wanted to continue to withhold military assistance to Ukraine until the country helped with investigations into former Vice President Joe Biden Joe BidenBiden leads Trump by 36 points nationally among Latinos: poll GOP set to release controversial Biden report Can Donald Trump maintain new momentum until this November? MORE and other Democrats.

At an event in Sarasota, Fla., on Monday, Kelly threw his support behind Bolton.

“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.”

The Senate is expected to vote this week on the pivotal issue of whether new witnesses and documentary evidence will be admitted at Trump’s Senate trial.