The fourth day of the public impeachment proceedings will take place in two parts. Gordon Sondland, U.S. Ambassador to the European Union, will testify at the public hearing before the House Intelligence Committee at 9am.Part two of the hearing will be a panel featuring testimonies from Laura Cooper, Deputy Assistant Defense Secretary for Ukrainian and Eurasian affairs and David Hale, Undersecretary of State for Political Affairs. Chairman Schiff is expected to gavel-in the second hearing of the day at 2:30 p.m. ET.