By Brian Stelter, 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.

The author's critics are sure to be skeptical of his methods this time too.

Wolff has been working with the same editor, John Sterling, who edited "Fire and Fury."

Axios reported that Wolff has followed up with most of the key sources for the first book.

In a press release on Wednesday, Henry Holt described the sequel as an "equally essential and explosive book about a presidency that is under fire from almost every side."

According to the publisher, the book begins "just as Trump's second year as president is getting underway, and ends with the delivery of the Mueller report," documenting "an administration that is perpetually beleaguered by investigations and a president who is increasingly volatile, erratic, and exposed."

To date "Fire and Fury" has sold more than four million copies around the world — making it one of the top sellers of 2018.