The insiders say former National Security Council adviser Fiona Hill told lawmakers that in July, Bolton, her boss at the time, told her to speak to White House lawyers about the shadow foreign policy Giuliani and other Trump allies were carrying out to benefit Trump in Ukraine.
The NYT also reported that during her congressional testimony the former White House official also said Bolton described Giuliani as "a hand grenade who's going to blow everyone up".
Hill, a top adviser on Russian Federation, also referred to US ambassador Gordon Sondland and acting White House chief of staff Mick Mulvaney, the person said, telling the three committees leading the investigation that Bolton also told her he was not part of "whatever drug deal Sondland and Mulvaney are cooking up", an apparent reference to talks over Ukraine.
"Nancy Pelosi has chosen to reshuffle the legislative deck because her Democrats were getting worked silly on the Judiciary Committee following the Lewandowski hearing, the John Dean hearing, it really was not a forum that fielded results for Democrats", he said recalling previous hearings with witnesses Corey Lewandowski and former Nixon counsel John Dean.
Kent, a deputy assistant secretary of state responsible for USA policy toward six former Soviet republics including Ukraine, is scheduled to appear behind closed doors before the three House committees conducting the impeachment inquiry.
The White House demanded Hill limit her testimony to the contents of the 25 July telephone call and warned she could not discuss internal deliberations or diplomatic communications about the conversation, according to a letter dated Monday from a White House lawyer to Hill's attorney that was seen by Reuters.
A person familiar with the proceedings confirmed that Deputy Assistant Secretary of Defences Laura Cooper would be interviewed by the committees on Friday.
Though Yovanovitch's term as ambassador was curtailed earlier than planned in May, she remains an employee of the State Department, and her testimony has been held up as a model of how Congress can use subpoenas to help officials circumvent the administration's refusal to cooperate in the impeachment probe.
To form a top aide to Secretary of State Mike Pompeo has also been asked to appear for an interview this week, according to several officials familiar with the planning.
The former adviser officially departed her role in August - though she had handed over most of her responsibilities in July - but was involved as Giuliani was making public pronouncements about Ukraine. Gordon Sondland, the US ambassador to the European Union, is expected to testify on October 17. "The President has been crystal clear no quid pro quo's of any kind, " he said in the text message.
In one he demanded that a whistleblower whose warning about the United States president's call with Ukraine triggered the impeachment inquiry be identified and testify before Congress.
The committees are also scheduled to talk to Ulrich Brechbuhl, a State Department counselor, on Thursday. He is scheduled to testify behind closed doors Wednesday.
The White House's call memo shows Mr Trump sought a "favour" from Mr Zelensky. Lawmakers have been deeply concerned about the subject of trump's threats and may not wish to risk exposing the whistleblower's identity.
The complaint filed to the inspector general of the intelligence community claimed Trump pressed Zelensky to launch an investigation into Democratic presidential candidate Joe Biden and his son Hunter.
Who else has been called to testify?
"Given that we already have the call record, we don't need the whistleblower who wasn't on the call to tell us what took place during the call, we have the best evidence of that", he said.
Trump gave his backing to Giuliani on Saturday, tweeting that he was a "great guy and wonderful lawyer".
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