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 USA foreign policy for his personal gain.
I had a very good call with the President of Ukraine. "And he said that I said that".
"This is a third party who was not privy to the call and did not have firsthand information", said Ivanka Trump, who is wrapping up a three-day visit to Morocco.
Given Bolton's refusal so far to testify, Hill's account may be the closest that investigators get to his perspective on the Ukraine affair.
-House Republicans came forward Saturday with a list of witnesses they want the House Intelligence Committee to hear from in the public hearings set to start this coming week.
Vindman listened in to the July 25 call where Trump personally appealed to Ukrainian President Volodymyr Zelenskiy for the investigations of political rival Joe Biden and his family and also Ukraine's role in the 2016 USA presidential election.
Efforts to fill out the picture have been stymied by the White House's insistence that top administration officials defy congressional subpoenas.
A national security official called in to testify before House committees on the impeachment inquiry into President Donald Trump says a diplomat specifically mentioned that the Ukrainians would have to investigate the Bidens.
Mulvaney did not appear for his scheduled testimony Friday morning despite him receiving a subpoena, because the White House told him he should not appear, claiming that legally he is immune.
Hill also testified that then-National Security Adviser John Bolton thought such an arrangement was inappropriate.
U.S. President Donald Trump speaks to members of the media before boarding Marine One on the South Lawn of the White House in Washington, D.C., U.S., on Monday, Nov. 4, 2019. Both testified about their concerns as Trump pressed Ukraine to investigate Democrats.
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Mulvaney also notes he's in an especially powerful and unique role within the White House, making protection of his interactions with the President even more necessary for the court to weigh.