Veteran journalist Bob Woodward claims he has “boxes of recordings and documents” to back up the accounts made in his explosive new book, “Fear: Trump in the White House.”

In an interview with CNN host Anderson Cooper on Wednesday night, Woodward said he recorded “almost all” of the interviews he conducted with current and former Trump administration officials for his book, which President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and the White House have repeatedly sought to discredit.

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“The deal was I would interview somebody, they would be a confidential source,” Woodward told Cooper. “I know who they are, they're describing specific events.”

“Often there are diaries or notes or documents supporting it,” the journalist added.

Woodward, the reporter who rose to fame for uncovering the Watergate scandal, said that several times during interviews with current and former officials the subject would request to go off the record, which Woodward said he refused to allow.

"A couple of times people would say, 'I want to go off the record,' " Woodward said. "And I said no."

"In every case, maybe except one, [they] said, 'OK, I'll tell you anyway on deep background,’ ” Woodward said.

"When somebody looks at this in 20 or 30 or 40 years, boxes of recordings and documents, they will see that this was very carefully done," Woodward continued. "I can argue with a straight face that an ardent Trump supporter would read this and have to pause. Because whether you like Trump or don't like Trump, it's a management issue."

The president has repeatedly lashed out at Woodward over the book in the past several days and has called him a "liar."

The White House on Monday called Woodward's work "reckless” and would not rule out the possibility of a lawsuit.

Woodward's book reportedly sold more than 750,000 copies through its first day of release this week, the most for any title in Simon & Schuster history, according to the 94-year-old publisher.