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 TrumpJimmy Fallon responds to Trump: I'll donate to pro-immigrant nonprofit in his name South Carolina GOP candidate expected to make full recovery after car accident Official: US to present North Korea with timeline, 'specific asks' 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 ManafortWhat did Peter Strzok do? Manafort's attorney asks judge to bar mention of Trump ties in trial Mueller may be preparing to hand off prosecution as part of winding down his investigation: report MORE was indicted on charges including conspiracy against the United States, tax fraud and money laundering in connection with the Russia probe.