Quinn Emanuel Urquhart & Sullivan litigator William Burck will be representing U.S. Secretary of State Mike Pompeo in any pending legal matters surrounding the Trump administration’s handling of military aid to Ukraine, a person with knowledge of the relationship confirmed.

A co-managing partner of Quinn Emanuel’s Washington, D.C., office, Burck is already representing senior National Security Council attorney John Eisenberg in the House impeachment inquiry, which is focused on whether the president improperly used foreign policy to advance his domestic political fortunes.