Michael Wolff, the author of the controversial new book on the Trump White House, said people close to President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE are "afraid" for the country.

Wolff, during an interview with PBS News, said he had no agenda when doing reporting for his book.

"I went into this experience just waiting to hear what people would tell me," he said.

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"And what they told me, the people closest to the president, was that things became more alarming by the day, that all of them, in some way or other, were afraid, afraid for their — both for their own careers and for the country."

Wolff said people close to the president "just didn't know what to do."

"They didn’t know what to expect. They woke up in the morning, and they were in, you know, in something of a cold sweat," he said.

"Almost all of them — for almost all of them, it was a countdown until when they could leave."

Wolff's book, "Fire and Fury," has sparked controversy and faced pushback from Trump and his allies.

Stephen Miller this past weekend also tore into the book, calling it a “grotesque work of fiction” and a “pile of trash” on CNN before host Jake Tapper cut off the senior White House adviser and ended the interview.

Last week, Trump's attorney Charles Harder sent a letter to Wolff's publisher demanding it discontinue publication of the book and offer a full retraction and apology to the president.

Attorneys for Wolff’s publisher fired back this week, calling the legal threats against the author “a gross violation of the First Amendment” and saying that publication of the book would continue.