On Tuesday, House investigators heard from Deputy Assistant Secretary of State George Kent, who was concerned about the "fake news smear" against the US ambassador to Ukraine, Marie Yovanovitch, whom Trump recalled in May, according to emails obtained by the Associated Press.
Yovanovitch, a career foreign service officer, testified Friday that Trump pushed the State Department to remove her from the post.
It follows the emergence of a Central Intelligence Agency whistleblower complaint raised in response to Mr Trump's call with Ukrainian President Volodymyr Zelensky on July 25.
This also serves as a reminder that Trump may believe his call with Ukrainian President Volodymyr Zelensky was "perfect" and uncontroversial, but a whole lot of White House officials in Trump's immediate orbit seemed to know better.
Trump, White House official and Republicans on Capitol Hill have seized on the absence of such an vote as an unacceptable break with House precedent and have vowed to resist what they describe as an illegitimate probe. Of particular interest is whether, and to what extent, Mulvaney may have been involved in blocking US military aid to Ukraine, which was apparently part of the broader political scheme to gain leverage over the country.
Tuesday's appearance by Kent, the Deputy Assistant Secretary of State for European and Eurasian Affairs, was due to be followed Wednesday by testimony from former senior diplomat Michael McKinley, who resigned last week. The pair left the meeting and Bolton advised her to consult with John Eisenberg, the top National Security Council lawyer. Mick Mulvaney, the acting White House chief of staff, was also seen as a key player, according to Ms Hill's testimony. "The big news from what we're hearing is from people close to Rudy Giuliani is that they are very concerned about Rudy".
He said that he is no longer using the services of lawyer Jon Sale, saying that if Congress were to enforce the subpoena, he will retain counsel.
Hill told lawmakers that Bolton characterized Giuliani as "a hand grenade who is going to blow everybody up", according to two sources familiar with her testimony.
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Who else has been called to testify?.
The Trump administration's removal in May of Marie Yovanovitch as U.S. ambassador to Ukraine may have figured in Hill's testimony.
Sondland is expected to be asked why he relayed from Trump to other diplomats that the president said no "quid pro quos" connecting the Biden investigation with the U.S. aid.
"There are multiple levels of misconduct here and look, there were 12 people on that call that the president made to the Ukraine president", Lynch, a Democrat representing Massachusetts' 8th District, said in an interview with CNN.
Mr Giuliani had faced a Tuesday deadline to produce the requested documents.
The committees are also scheduled to talk to Ulrich Brechbuhl, a State Department counselor, on Thursday.
Three House committees are probing Mr Trump's attempts to push Ukraine to dig up dirt on his Democratic 2020 challenger Joe Biden and his son Hunter, who had business dealings in the country.
Officials in Kiev have said there is no evidence to support the allegations, which the Biden camp calls a smear.