Jennifer Williams, a career foreign service officer and special adviser to Pence for Europe and Russian Federation, was testifying in a closed-door hearing in front of members of the foreign affairs, intelligence and oversight committees of the House after receiving a subpoena.
Taylor has provided some of the most damaging testimony to date, telling lawmakers on October 22 that Trump made the release of almost $400 million in security aid to Ukraine contingent on Ukrainian President Volodymyr Zelenskiy publicly declaring Kiev would carry out politically motivated investigations demanded by Trump.
But on Wednesday, Rep. Adam Schiff, the chairman of the House Intelligence Committee, announced that televised hearings would begin next Wednesday. The committee withdrew its subpoena to Kupperman on Wednesday.
In addition to Bolton, Democrats had requested interviews from two other high-level Trump administration witnesses, acting White House Chief of Staff Mick Mulvaney and Energy Secretary Rick Perry. They say they will simply use the no-shows as evidence of the president's obstruction of Congress.
Bolton had been asked to appear for testimony behind closed doors on Thursday, but failed to appear.
Three other witnesses summoned by the House committees were not expected to appear. "We expect her testimony will largely reflect what is already in the public record", attorney Justin Shur said.
Those who know Williams describe her as a smart diplomat.
Meanwhile, lawmakers continued to spar over the significance of revised testimony by Gordon Sondland, the US ambassador to the European Union.
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Zelenskiy "opened the meeting" by asking Pence about security cooperation, Taylor testified.
In a closed-door deposition, Taylor bolstered the principal accusation against Trump - that the president abused his office by withholding military aid to blackmail Kiev into launching investigations that could help him politically.
An anonymous whistleblower filed a complaint in September highlighting potential abuse of power by the president when he telephoned Ukraine's leader and asked him to investigate Trump's potential 2020 election rival Joe Biden.
Pence told reporters the next day that he didn't discuss Biden with Zelenskiy. She was puzzled about it, but was kept in the dark about the decision-making process. "In response to his request, they said, we won't monitor and will not - and we certainly won't transcribe because we're going to sign off".
Leading up to his discovery of evidence there was a quid pro quo, Taylor said he began to raise concerns with USA officials, including Secretary of State Mike Pompeo, about why the aid was not being released.
Kent told investigators that that was his understanding of what Trump wanted Ukraine President Volodymyr Zelenskiy to say in public, based on conversations relayed to him by others in the administration who were in contact with Ambassador Gordon Sondland. "I don't know what was in the President's mind".
Under questioning from Rep. John Ratcliffe, R-Texas, Taylor also testified that the Ukrainian government wasn't aware USA military funding had been temporarily suspended until late August, and then only after the information was leaked to the news media, meaning an alleged quid pro quo would have been impossible.