"Andrew didn't give a s-t about politics", said Ben Shapiro, a former Breitbart News editor who runs the conservative news site Daily Wire.
Journalist Michael Wolff's supposed exposé on the Trump administration, Fire and Fury hit bookstands last week amid a wave of controversy, media hysteria, angry tweets and legal threats from President Donald Trump.
That didn't sit well with Trump - who threatened Bannon with a lawsuit and claimed on Twitter that Bannon had "lost his mind".
Bannon was sacked by Trump in August as the president tried to bring order to feuding factions in the White House, but the two men continued to communicate and Bannon had remained an ally.
Characteristically, it was neither an apology nor a denial - merely an expression of admiration for President Trump and his eldest son, and an assertion that he had been referring only to Manafort.
"And you have not heard the last from me", he said. This is a direct reference to Bannon's time in the U.S. Navy where he served as a special assistant to the Chief of Naval Operations working on budget issues after two relatively unremarkable non-combat deployments at sea.
One of the chief architects of the nativist Make America Great Again rebellion has gone from one of the top jobs in the White House to being too toxic even for their house publication Breitbart.
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Wolff's book, Fire and Fury: Inside the Trump White House, characterised Trump as mentally unstable, inept and unprepared for the presidency.
White House press secretary Sarah Huckabee Sanders said last Thursday that Breitbart should "look at and consider" cutting ties with Bannon. The most damaging blow in the book is by Bannon, who called Trump Jr.'s 2016 meeting with a Russian lawyer "treasonous" and "unpatriotic".
"I regret that my delay in responding to the inaccurate reporting regarding Don Jr has diverted attention from the president's historical accomplishments in the first year of his presidency", Mr Bannon said.
The influential Mercer billionaire family, major backers of Breitbart and Bannon cut off all contact with Bannon after release of passages of the book.
He conducted 200 interviews including Mr Trump and took, according to him, "something like a semi-permanent seat on a couch in the West Wing" to do so. "When he was sacked, he not only lost his job, he lost his mind".
It's unclear what will happen next to Bannon, who joined Breitbart in 2012.
Among them was Trump's primary backer in the election, Rebekah Mercer.