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Wolff: WH officials think if Mueller targets Trump's finances, ‘he’s sunk’

Author Michael Wolff said people in the White House believe that if special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE looks into President TrumpDonald John TrumpTrump renews attacks against Tester over VA nominee on eve of Montana rally Trump submits 2017 federal income tax returns Corker: Trump administration 'clamped down' on Saudi intel, canceled briefing MORE's finances in the Russia probe, the president is "sunk."

"People don't think in the White House — don't think that he colluded with Russia," Wolff, the author of a controversial new book on the Trump White House, said during an interview with CNBC's "Squawk Box."

"They do think that if the investigation goes near his finances, he's sunk."

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Wolff also said he was "confident" in the accuracy of everything printed in his book, "Fire and Fury: Inside the Trump White House."

The book, released last week, has sparked controversy. Trump and his allies have criticized the book and sought to defend the president against the allegations made in it.

Mueller is currently investigating Russia's interference in the 2016 presidential election and potential collusion between the Trump campaign and Moscow.

According to a report published Monday, Trump's legal team is talking about possible formats in the case that Mueller asks to interview Trump in the Russia investigation.

Trump has repeatedly dismissed the Russia probe as a "witch hunt" and denied collusion.

In July Trump warned Mueller against investigating his family's finances beyond the probe into ties between his campaign and Russia.

Last year, former Trump campaign chairman Paul ManafortPaul John ManafortMueller assembles team of cooperators in Russian probe Hillicon Valley: Russia-linked hackers hit Eastern European companies | Twitter shares data on influence campaigns | Dems blast Trump over China interference claims | Saudi crisis tests Silicon Valley | Apple to let customers download their data Mueller's team asking Manafort about Roger Stone: report MORE was indicted on charges including conspiracy against the United States, tax fraud and money laundering in connection with the Russia probe.