The Republican National Committee announced Monday that Michael Cohen, longtime attorney and ally to President Donald Trump, will join its financial team.

Cohen, who remains Trump’s personal attorney, will serve as one of several national deputy chairmen.

The brash, New York-based lawyer is a central figure in Trump world, serving as special counsel to the Trump Organization for over a decade and sitting on the boards of the Eric Trump Foundation and Miss Universe Organization. He raised millions for Trump’s presidential campaign and was known for making graphic threats to news organizations that published stories that cast Trump in an unflattering light.

Cohen was also involved in a back-channel scheme to convince the Trump administration to lift sanctions against Russia. He told the New York Times in February that he helped deliver a “peace plan” drawn up by a member of the Ukrainian parliament to fired National Security Adviser Michael Flynn, before denying that he did so to the Washington Post just one day later.

Cohen was a lifelong Democrat who was unable to vote for his boss in the Empire State primary because of his party affiliation. On March 9, he announced he’d finally “made the official move” to register as a Republican.