Colbert mocks Trump over Woodward book quote comparing him to 'fifth- or sixth-grader'

CBS late-night host Stephen Colbert mocked President TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE on Tuesday night over a quote in veteran journalist Bob Woodward's forthcoming book comparing the president to a "fifth- or sixth-grader."

Colbert pointed to an excerpt of Woodard's book about the Trump White House, which quotes Defense Secretary James MattisJames Norman MattisTrump nominates ambassador to Turkey Overnight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants Top US general: Trump wrong on Syria pullout, ISIS defeat MORE discussing Trump's understanding of the situation on the Korea Peninsula.

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“Secretary Jim Mattis struggled to convince Trump that troops should stay in South Korea. Afterwards, Mattis told associates ‘that the president acted like — and had the understanding of — "a fifth- or sixth-grader,"'” Colbert said, quoting Woodward’s book.

Colbert, a frequent critic of Trump, joked about creating a new game show he dubbed "Are You Smarter Than The President?" He said the fictional game show would be a "show where everyone’s a winner."

Mattis on Tuesday denied having said the words attributed to him in Woodward's book, calling it “fiction” and “a product of someone’s rich imagination.”

“The contemptuous words about the President attributed to me in Woodward's book were never uttered by me or in my presence,” Mattis said in a statement.

“While I generally enjoy reading fiction, this is a uniquely Washington brand of literature, and his anonymous sources do not lend credibility,” he added.

The president also blasted the book on Wednesday, asking why politicians don’t change libel laws to punish what he says is a work of fiction.

“Isn’t it a shame that someone can write an article or book, totally make up stories and form a picture of a person that is literally the exact opposite of the fact, and get away with it without retribution or cost,” Trump tweeted.

“Don’t know why Washington politicians don’t change libel laws?” Trump added.