Dr. Fiona Hill, the former senior director for Europe and Russia on the National Security Council, and David Holmes, a Foreign Service officer who works for Ambassador William Taylor at the U.S Embassy in Kyiv, Ukraine, testify before the House Intelligence Committee Thursday.

It’s the fifth day of public hearings as part of the impeachment probe into President Donald Trump.

Holmes emerged as a key witness when Taylor told the Intelligence Committee in public testimony last week that his aide overheard a call between Gordan Sondland, the U.S. ambassador to the European Union, and Trump in which the president asked about the status of investigations he wanted Ukraine to open.