Peter Hyun, a former chief counsel to California Sen. Dianne Feinstein, has joined Wiley Rein as a partner in Washington, D.C.

Hyun will work out of Wiley Rein’s white-collar defense and government investigations practice, where he will defend clients in congressional investigations, government enforcement actions and state attorneys general investigations. He said Monday that he expects a looming shift in political power from Republicans to Democrats in the U.S. House of Representatives will create an uptick in congressional investigations that in private practice will yield new business for him on matters as disparate as drug pricing and CEO compensation.