The person identified as a senior Trump administration official who anonymously penned an explosive op-ed in The New York Times last year has written a tell-all book about Donald Trump's presidency.

The book, titled "A Warning," is set to be released on Nov. 19, according to a press release from publishing company Twelve, part of Hachette Book Group. The publisher says the person's identity will remain a secret and that the book picks up "where those first words of warning left off."

The author wrote in the September 2018 op-ed called "I Am Part of the Resistance Inside the Trump Administration" that Trump's behavior is "erratic" and that his aides were working to keep some of his "bad decisions" contained.

"It may be cold comfort in this chaotic era, but Americans should know that there are adults in the room. We fully recognize what is happening. And we are trying to do what’s right even when Donald Trump won’t," the anonymous author wrote.

Trump publicly blasted the author at the time and accused the Times of fabricating the op-ed.

"Does the so-called 'Senior Administration Official' really exist, or is it just the Failing New York Times with another phony source?" Trump tweeted.

The Times' decision to publish an op-ed anonymously was highly unusual. The paper has knowledge of the op-ed writer's identity, but those details remain unknown to the public.

White House officials said it is unfair to allow the author to remain anonymous, and even some Trump critics wonder why Anonymous should remain anonymous.

"It takes a lot conviction and bravery to write a whole book anonymously," said White House press secretary Stephanie Grisham.

Cliff Sims, former White House aide, author his own book called “Team of Vipers" also criticized the book.

He tweeted: "This anonymous coward will be lionized be the media but there’s nothing honorable about being “the resistance” inside the Admin & undermining the duly elected POTUS. What a disgrace. If this were being done to Obama the media would be screaming TREASON."

"The author of this book should report any alleged wrongdoing so the matter can be investigated," said Renato Mariotti, a former federal prosecutor who has been critical of Trump.

"And if the author is aware of disturbing information that the public ought to know that does not amount to wrongdoing, should come forward so the public can assess that information and the author’s credibility," Mariotti said. "If the author continues to serve in the administration, he or she should resign in order to speak freely."

The book comes as Trump is embroiled in an impeachment probe into his dealings with Ukraine, sparked by a whistleblower complaint, also from an anonymous person. Trump is accused of improperly pressuring a foreign leader to investigate domestic political rivals in exchange for military aid.

The publisher says that the anonymous book author did not take an advance payment for the book, and plans to donate a substantial amount of royalties to "non-profit organizations that focus on government accountability and on supporting those who stand up for the truth in repressive countries around the world."

"The author sees this as an act of conscience and of duty," a representative of the author, Matt Latimer, told The Washington Post.