New York (CNN Business) John Bolton has stayed pretty quiet since resigning as President Trump's national security adviser in September. But he evidently has a book's worth of something to say.

Bolton has struck a deal to write a book for Simon & Schuster, according to two sources with knowledge of the deal.

One of the sources said the book will come out sometime in 2020 before the presidential election.

The publishing house declined to comment on Saturday, as did a spokesperson for Bolton.

Bolton was previously reported to be in talks about a potential book project -- which sparked speculation about whether he would publicly break with Trump

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