Michael Wolff, the author of the new White House tell-all "Fire and Fury," said Monday both current and former top White House officials encouraged other aides "to cooperate" in interviews for the book.

"Everybody was told to speak to me," Wolff said in an excerpt from his interview set to air in full on CNN's "Tonight with Don Lemon."

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"[Stephen] Bannon told people to cooperate, Sean Spicer Sean Michael SpicerKellyanne Conway to leave White House at end of month Pro-Trump duo Diamond and Silk launch new program on Newsmax TV The Hill's 12:30 Report - Presented by Facebook - Supreme Court's unanimous decision on the Electoral College MORE told people to cooperate, Kellyanne Conway Kellyanne Elizabeth ConwayGeorge and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE told people to cooperate, Hope Hicks Hope Charlotte HicksSenate intel leaders said Trump associates may have presented misleading testimony during Russia probe: report Cuomo turned down Trump invitation to participate in April press briefing: report Trump shakes up White House communications team MORE," he said respectively about the president's former chief strategist, former press secretary, senior adviser and current communications director.

Wolff said he conducted more than 200 interviews for his new book, "Fire and Fury: Inside the Trump White House," which paints President Trump as an unstable leader leading a White House in chaos.

“Why are they saying its fake?” Lemon asks.

“Because they are liars," Wolff responds. "He doesn’t tell the truth because he doesn’t know what the truth is."

In a statement to The Hill, Spicer said it was Wolff who has a problem with truth and lies.

"Considering his track record, chalk this up to another made up story by Michael Wolff. There is not a single staffer that I asked to cooperate with or meet with him," Spicer said.

Conway and Hicks did not immediately respond to requests to comment on Wolff's remark.

Wolff claims in his book that "every single" person around Trump questions "his intelligence and fitness for office."

Trump has repeatedly blasted the book as "full of lies." Some White House officials have fiercely pushed back on the claims, while others have questioned some of Wolff's broad statements.

Wolff acknowledges in the book’s introduction that certain parts of the book reflect “a version of events I believe to be true" but that are sometimes based on conflicting accounts.

Many of the bombshells in the book come from quotes by Bannon.

The book quotes Bannon blasting Donald Trump Jr., calling him "treasonous" and "unpatriotic" for attending the now infamous June 2016 Trump Tower meeting with a Russian lawyer.

Bannon, who also made disparaging remarks about Ivanka Trump Ivana (Ivanka) Marie TrumpTrump luxury properties have charged US government .1M since inauguration: report Ivana Trump: Ivanka could 'definitely' be first female president The Hill's 12:30 Report - Presented by Facebook - Trump's West Coast campaign swing MORE and Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, later only walked back his remarks about the president's eldest son and said those comments were directed toward former campaign chairman Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE.

The White House, however, rejected Bannon's statement of "regret."

—Updated at 8:07 p.m.