New York (CNN Business) The Justice Department is going on the offensive against the anonymous author of "A Warning," telling them in a letter obtained by CNN Business that he or she may be violating "one or more nondisclosure agreements" by writing the anti-Trump book.

The author's publisher is rejecting the argument and saying the book will be released as scheduled.

And the author's agents are accusing the government of trying to unmask the author.

"Our author knows that the President is determined to unmask whistleblowers who may be in his midst. That's one of the reasons A WARNING was written," the literacy agency Javelin said in a statement. "But we support the publisher in its resolve that the administration's effort to intimidate and expose the senior official who has seen misconduct at the highest levels will not prevent this book from moving forward."

"A Warning" is set to come out on November 19, though it is likely to leak sooner. It is written by the same senior Trump administration official who was behind a 2018 New York Times op-ed expressing profound concern about the president's competence . Top editors at The Times said they knew the identity of the author, but granted the person anonymity to protect them from retaliation.

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