The House Intelligence Committee hears from Jennifer Williams, the State Department official who has served as a foreign policy adviser to Vice President Mike Pence, and Army Lt. Col. Alexander Vindman, director for European affairs at the National Security Council, in its impeachment inquiry into President Donald Trump. Vindman notably went to White House lawyers with concerns after listening to Trump’s July 25 phone call with Zelenskiy.

Roll Call will also be streaming the hearing scheduled for this afternoon. Republicans on the Intelligence Committee have called witnesses Kurt Volker, the former U.S. special envoy to Ukraine, and Tim Morrison, the former senior NSC director for Europe and Russia policy.