Lawmakers are seeking to find out how much Pence knew about efforts by Trump and those around him to pressure Ukraine to investigate former vice-president Joe Biden and his son Hunter, as well as foreign interference in the 2016 U.S. election. Trump said Saturday he has no problem making details of that call public.
She rejected any suggestion that her own family has been profiting off the presidency even as President Trump and his allies have criticized the involvement of Biden's son with a Ukrainian oil venture when Biden was vice president.
"Mr Mulvaney, like Mr Kupperman, finds himself caught in that division, trapped between the commands of two of its co-equal branches - with one of those branches threatening him with contempt".
The White House instructed its officials not to comply with the investigation, which is looking at President Donald Trump's dealings with Ukraine.
He later walked back his remarks and said the news media misconstrued them to further their "witch hunt".
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"What they want is they want my first phone call".
One Democratic member of the intelligence panel, Washington Rep. Denny Heck, said Thursday that there is "already a mountain of evidence" in the probe.
And witnesses have continued to come in. On Thursday, an aide to vice president Mike Pence appeared under subpoena and was deposed for more than four hours.
Adam Schiff, Carolyn Maloney and Eliot Engel, the respective heads of the House Intelligence, Oversight and Foreign Affairs committees, said Mr. Mulvaney was a vital, firsthand witness to an alleged quid pro quo.
The impeachment inquiry centres on a 25 July phone call between Trump and Zelenskiy in which the USA president asked his Ukrainian counterpart to "do us a favour". But, in an interview with The Associated Press, she parted ways with President Donald Trump by calling the identity of the impeachment whistleblower "not particularly relevant".
She did not know of any request from Trump to Pence to bring up investigations during a meeting the vice president had in Warsaw with Ukrainian President Volodymyr Zelensky on September 1.
Democrats have been releasing transcripts of the closed-door interviews as they prepare for the public hearings.
Ambassador William Taylor, a diplomat to Ukraine, and George Kent, deputy assistant secretary for European affairs, will testify on November 13 and Marie Yovanovitch, the former US ambassador to Ukraine, will testify on November 15, Schiff said.