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 BannonFBI investigating Chinese media tycoon linked to Bannon: report Mueller investigation witness George Nader sentenced to a decade in prison in child sex case Biden would fire Trump appointee leading US media agency for 'hijacking' outlet 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 TrumpDavis: Supreme Court decision is bad news for Trump, good news for Vance Meadows trying to root out suspected White House leakers by feeding them info: Axios Pressley hits DeVos over reopening schools: 'I wouldn't trust you to care for a house plant let alone my child' 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.