Elizabeth Prelogar, a Cooley partner in Washington and former assistant to the U.S. solicitor general who was a legal adviser in the special counsel probe of Russian interference in the 2016 election, will be the principal deputy U.S. solicitor general in the new Biden administration.

Prelogar is expected to step into her new Justice Department role Wednesday, according to sources close to the Biden transition team. She will serve as acting solicitor general until a new solicitor general is appointed and confirmed by the Senate.