The Justice Department on Monday swore in Joseph diGenova as counselor to the attorney general, elevating the Reagan-era prosecutor to a senior role amid a high-stakes federal investigation tied to the Trump-Russia case.

DiGenova was selected to assume a “senior advisory role” as counselor to the attorney general after reports of his appointment surfaced Saturday, the DOJ said. The move came as the department began to reshape leadership of a sweeping inquiry into former intelligence and law enforcement officials, including former CIA Director John Brennan, over their handling of politicized investigations related to the 2016 election and its aftermath.