Veteran journalist Bob Woodward said that President TrumpDonald John TrumpGrassley: Dems 'withheld information' on new Kavanaugh allegation Health advocates decry funding transfer over migrant children Groups plan mass walkout in support of Kavanaugh accuser MORE’s former attorney, John Dowd, concluded that the president is “disabled” and unable to “tell the truth” following a practice interview earlier this year meant to prepare Trump for a sit-down interview with the special counsel.

During an appearance on “The Late Show” on Monday night to promote his new book, “Fear: Trump in the White House,” Woodward was pressed by host Stephen Colbert about what fills him with fear.

“Not knowing,” Woodward responded, before adding that “we need to know what’s going on” in the White House.

Colbert then pointed to the final pages of Woodward’s new book, which he and the veteran journalist noted contained the “f-word.” 

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The late-night host also noted how Woodward had described Dowd after he finished his practice interview with the president in January, who the journalist noted had warned Trump he would be “fitted for an orange jumpsuit” if he were ever to actually sit down with Mueller’s team for a real interview. 

“Trump goes ballistic, makes things up, starts screaming. Dowd thought had he been Mueller, he would have been fired right on the spot,” Woodward told Colbert.

“‘You can’t testify. You, you are disabled,’” Woodward said, repeating remarks Dowd reportedly made toward Trump after the mock interview. “I mean, imagine the lawyer, your lawyer, telling you you’re disabled. ‘And you can’t testify because you can’t tell the truth. You just make things up!’”

Colbert then went on to read the final line of Woodward’s book, which included another alleged remark Dowd had made to the president at the time. 

“Dowd knew he couldn’t bring himself to say to the president, ‘You’re a f---ing liar,’” he read aloud.

“I think you buried the lead!” Colbert said to a crowd of laughs.

Dowd resigned from his role in March.

Trump has dismissed Woodward's book as a "joke."

On Friday, the president said that sitting down with Mueller’s team for an interview would be a “waste of time," but he also added that he’s open to it.

"Fear" hit bookshelves on Tuesday.