A US diplomat told lawmakers behind closed doors that he did overhear the July 26 phone conversation between President Trump and Ambassador to the European Union Gordon Sondland, and that on the call Trump asked Sondland if Ukraine was going to do the investigation, according to two sources familiar with the testimony.

Sondland replied that they were going to do it, the sources said.

David Holmes, the counselor for political affairs at the US Embassy in Ukraine, was able to hear the call because Sondland held the phone away from his ear due to how loud Trump was talking, the sources said.

Holmes also confirmed there were others at the table at the restaurant where he heard the call, according to the sources.

Asked about Holmes' testimony, Rep. Gerry Connolly told CNN's Wolf Blitzer that he was going to be "careful about what I just heard in closed session, but... I would say that the adverb used 'allegedly' is not accurate. It is not alleged. It happened. And it is a matter public record that Mr. Holmes heard this conversation and recognized the President's voice loud and clear."