which were eventually delivered but democrats allege the $400 million of military aid was held up by the president who tried to use it as leverage to pressure ukraine to investigate former vice president joe biden and his son, hunter. republicans today digging in in defense of the president. >> you know, that's a thing about facts. they don't change. we have the call transcript, we have the two individuals on the call, president trump, president zelensky, there was no link, pressure, or pushing whatsoever. >> reporter: in public hearings this week, three veteran ghats voicing their concerns about the president's conduct. late friday a fourth diplomat describing a phone call he overheard between president trump and eu ambassador gordon sondland the day after mr. trump's phone call with ukraine's president. state department official david holmes telling investigators he could hear the president's voice through ear piece of the phone asking about the investigation. holmes testified sondland later said the president did not give a blank about ukraine, but only