Longtime Donald Trump attorney and fixer Michael Cohen has brought in an outspoken critic of the president — a former special counsel for Bill Clinton — to help respond to a federal probe of his businesses and finances.

Lawyer and crisis manager Lanny Davis confirmed Thursday that he’s representing Cohen. Davis is the author of The Unmaking of the President 2016, in which he questions the legitimacy of Trump’s election and raises the possibility of removing Trump from office for “mental impairment.”

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“Cohen could have lots of different reasons for hiring Davis,” said David Sklansky, a law professor at Stanford University. “But Davis is a crisis manager, not a trial lawyer. You probably don’t hire him if your main focus at the moment is preparing for a knock-down-drag-out battle in court.”