Veteran reporter and author Bob Woodward discussed his new book, "Fear: Trump in the White House," with Dana Perino Wednesday on The Daily Briefing.

The book, which hit shelves on Tuesday, claims to reveal shocking details about the inner workings of the Trump administration.

In it, Woodward claims that Defense Secretary James Mattis once said the president has the understanding of "a fifth- or sixth-grader" and that White House Chief of Staff John Kelly called Trump an "idiot."

Mattis and Kelly have both denied the quotes attributed to them, while Trump accused Woodward of lying and fabricating his quotes.

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Woodward said on Wednesday that those who have said they've been inaccurately quoted in his book are engaging in a "politically calculated survival denial."

"These things get washed out as time moves on," he said.

President Trump tweeted on Monday that Woodward's book is "a joke" and "another assault" against him.

Fox News politics editor Chris Stirewalt added Tuesday on America's Newsroom that a bombshell book like Woodward's is just part of every presidency.

"He's been doing it since Nixon. It's part of the life cycle of every American presidency," he said.

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