House Democrats will hold the fourth public hearing of their impeachment inquiry on Tuesday with the testimonies of Ambassador Kurt Volker, former U.S. special envoy to Ukraine; and Mr. Tim Morrison, former special assistant to the President and senior director for Europe and Russia, National Security Council.

The House Intelligence Committee hearing, chaired by Adam Schiff (D-CA), is set to begin at 2:30 p.m. Eastern and follows an earlier hearing Tuesday which featured the testimonies of Ms. Jennifer Williams, special advisor for Europe and Russia, Office of the Vice President; and Army Lt. Col. Alexander Vindman, director for European Affairs, National Security Council.

Watch Tuesday’s first hearing below: