Committee Chairman Rep. Adam Schiff (D-CA) and Ranking Member Rep. Devin Nunes (R-CA) listen to Gordon Sondland, the U.S ambassador to the European Union, testify before the House Intelligence Committee on Capitol Hill in Washington on Nov. 20.
Former U.S. Ambassador to Ukraine Marie Yovanovitch (center) arrives at the U.S. Capitol to testify as part of the ongoing impeachment investigation against President Donald Trump in Washington on Oct. 11.