"Fire and Fury" author Michael Wolff said he believes Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE — President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE’s son-in-law and senior adviser — will be indicted in special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's probe, and would likely turn on Trump.

The author of the best-selling book detailing the inner workings of the Trump White House said at an event in London that the Russia investigation could trigger the biggest crisis the administration will face, all before the midterm elections.

Wolff said "there is a pretty good possibility at this point that Jared will be indicted,” according to a report by HuffPost.

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“So the more direct question is will Trump throw his son-in-law under the bus, and then the corollary to that is, will his son-in-law throw his father-in-law under the bus?” Wolff said. “And I think the answer to both of those questions is ‘yes.' ”

Kushner has been the center of controversy recently after former White House staff secretary Rob Porter’s resignation triggered chief of staff John Kelly John Francis KellyMORE to change the rules for obtaining a security clearance.

Porter resigned after his two ex-wives accused him of domestic abuse.

Kushner has been working with a temporary security clearance because of complications in his background check and, under Kelly’s rules, he may have to give up his interim security clearance soon.

Trump has left it up to Kelly to decide on Kushner’s security clearance, creating a point of tension between Kelly and Kushner.

At the London event, Wolff also described Kushner and Ivanka Trump Ivana (Ivanka) Marie TrumpTrump, Biden vie for Minnesota Trump luxury properties have charged US government .1M since inauguration: report Ivana Trump: Ivanka could 'definitely' be first female president MORE as “the most entitled people on earth” saying they didn’t have any relevant experience to hold the positions they were given by the president.