Fiona Hill and David Holmes sworn into Congress for impeachment testimony Fiona Hill and David Holmes - the latest witnesses in the impeachment trial - arrive in Congress before giving sworn testimony on the fifth day of televised hearings. Hill is a former National Security Council senior adviser for Europe and Russia, and Holmes is a political counselor at the US Embassy in Ukraine, who testified that he overheard a controversial phone call between Ambassador Gordon Sondland and President Donald Trump. IMAGES AND SOUNDBITES