A BBC News anchor on Tuesday confronted Michael Wolff about his new book, “Siege: Trump Under Fire,” and his use of ex-White House chief strategist Steve BannonStephen (Steve) Kevin BannonRussian intel planted Seth Rich conspiracy theory: report Former Breitbart White House correspondent to join Trump administration Tillerson told lawmakers Kushner didn't alert him to Saudi meeting MORE as a major source.

BBC "Newsnight" anchor Emily Maitlis pressed Wolff on his reliance on Bannon, who Wolff refers to in his book as “the Virgil anyone might be lucky enough to have as a guide for a descent into Trumpworld,” calling the former White House official an “embittered ex-employee.”

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“So, Steve Bannon could’ve written the book,” Maitlis said, adding, “It feels like Bannon’s book — reads a bit like you’ve been played, Michael.”

She later asked, “Why on earth would you choose an embittered ex-employee as a primary source?”

“Steve Bannon is a figure, a character throughout the book because, certainly in my experience, he is the one person who has understood Donald Trump at every step of the way,” Wolff replied. “These two men are in this remarkable co-dependent relationship.”

Wolff added: “I believe that Steve’s conflicted relationship with Donald Trump has actually produced incredible insights on his part into who this man is.”

Bannon reportedly hasn’t talked to Trump since he was fired, according to The Washington Post.

The book follows the tell-all “Fire and Fury," about President TrumpDonald John TrumpThe Hill's Morning Report: Trump walks back from 'send her back' chants Iran denies US destroyed one of its drones Trump faces new hit on deficit MORE’s early months in office. “Fire and Fury” also came under fire for its sourcing and the claims it made, with critics questioning its accuracy.