New York (CNN Business) As soon as Michael Wolff finished "Fire and Fury," he started gathering information for a sequel about President Trump.

And that followup book, "Siege: Trump Under Fire," will come out on June 4.

Wolff's publisher, Henry Holt, announced the title and publication date on Wednesday morning. Books are normally promoted months ahead of time, but the publisher kept this project hush-hush and chose to announce it just three weeks before release for maximum impact.

Axios was the first to report on the publication plans on Wednesday. Expectations for "Siege" will be sky-high, of course, given the bombshell claims in Wolff's first book about Trump.

Fire and Fury " prompted one of the president's personal attorneys to send cease and desist letters to the publisher and author. The book portrayed the White House as chaotic and Trump as incapable. It sparked weeks of discussion about the president's fitness for office, as well as controversies over Wolff's anonymous sourcing.

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