"His assertions and allegations against former Ambassador Yovanovitch were without basis, untrue, period", Deputy Assistant Secretary of State for European and Eurasian Affairs George Kenttold lawmakers during a closed-door session on October 15 as part of their impeachment probe of Trump.
In a preview of what is to come, lawmakers leading the probe released testimony that showed the top USA diplomat in Ukraine, William Taylor, believed a White House-led effort to pressure Kiev to investigate Ukrainian energy company Burisma was motivated by a desire to help Trump win re-election next year.
"Potus wanted nothing less than President Zelenskyy to go to the microphone and say investigations, Biden and Clinton", Kent testified.
"That was the message".
Mulvaney dramatically confirmed last month that Trump froze almost $400 million in United States security aid to Ukraine partially to pressure the country into investigating Democrats - and proceeded hours later to deny having said so.
They are trying to determine whether Trump froze US$391 million (S$540 million) in United States security assistance for Ukraine to put pressure on Zelenskiy to conduct the investigation, misusing United States foreign policy for his personal gain.
Taylor, who came out of retirement in June to serve as a special USA envoy to Ukraine, will be the first of two witnesses to recount their private testimony in a public setting, as the impeachment inquiry enters a new, more television-friendly phase.
Williams was one of a handful of United States officials who listened in on the call.
The Washington Postreported Wednesday night that Trump in September, when the administration released a rough transcript of the call with President Volodymyr Zelensky, floated a request to White House aides and in turn the Justice Department that Barr declare to the press that Trump had broken no laws.
Democrats subpoenaed Mulvaney late Thursday as the White House signalled that he wouldn't appear.
He said that Vindman told him that "the conversation went into the direction of some of the most extreme narratives that have been discussed publicly".
"A$3 s I understood the reason for investigating Burisma was to cast Vice President Biden in a bad light", Taylor said.
"This has been a very bad experience for me", Sondland said last month during a almost 10-hour grilling by members of the House committees conducting the impeachment investigation.