WASHINGTON — Former White House chief strategist Steve Bannon is stepping down as chairman of Breitbart News Network after a public break with President Donald Trump.

Breitbart announced Tuesday that Bannon would step down as executive chairman of the conservative news site, less than a week after Bannon’s explosive criticisms of Trump and his family were published in a new book.

A report on the Breitbart website quotes Bannon saying, “I’m proud of what the Breitbart team has accomplished in so short a period of time in building out a world-class news platform.”

Trump lashed out at Bannon for comments made in Michael Wolff’s “Fire and Fury: Inside the Trump White House,” which questions the president’s fitness for office. As Trump aides called him disloyal and disgraceful, the president branded his former chief strategist on Twitter as “Sloppy Steve,” an apparent reference to Bannon’s appearance, and declared “he lost his mind” when he was pushed out of the White House last August.

The president was livid about Bannon’s remarks — not just at the insults about his family, but also at his former strategist’s apparent intent to take credit for Trump’s election victory and political movement, according to a White House official.

After days of silence amid withering criticism from his former colleagues and his largest benefactor, Bannon tried to make amends. He issued a statement Sunday praising the president’s eldest son, Donald Trump Jr., whom he was quoted accusing of treasonous behavior in the book. Bannon did not apologize for his criticism of the president’s daughter and son-in-law, Ivanka Trump and Jared Kushner, with whom he had squabbled inside the West Wing.

Bannon’s departure from Breitbart came as a shock to some of his allies. One said Bannon was telling people as recently as Monday that he expected to stay on.

Bannon’s breakup with Breitbart is also costing him his daily show on the conservative talk station on satellite radio network SiriusXM.

Inside the White House, Bannon was viewed as the keeper of Trump’s nationalistic flame, charting the progress on the president’s promises to his base on dry erase boards in his office. But Bannon was marginalized in the months before his ouster over Trump’s concerns that the top aide was being viewed as an Oval Office puppeteer.