U.S. President Donald Trump speaks during an event on transparency in healthcare prices in Washington, D.C., U.S., on Friday, Nov. 15, 2019. Alex Edelman | Bloomberg | Getty Images

President Donald Trump on Sunday attacked Jennifer Williams, a special advisor to Vice President Mike Pence, a day after the House Intelligence Committee released testimony in which she called the July 25 phone call between Trump and Ukraine President Volodymyr Zelensky "unusual and inappropriate." "Tell Jennifer Williams, whoever that is, to read BOTH transcripts of the presidential calls, & see the just released statement from Ukraine," the president wrote on Twitter. "Then she should meet with the other Never Trumpers, who I don't know & mostly never even heard of, & work out a better presidential attack!"

A spokesperson for the vice president's office, responding to a request for comment on Trump's remarks, simply said "Jennifer is a State Department employee."



While Williams is a State Department employee, she has been detailed to Pence's national security council staff to work on issues related to Europe and Russia.

In the phone call, Trump asked Zelensky to investigate former Vice President Joe Biden and his son Hunter. Since then, House Democrats have launched an impeachment inquiry against the president over allegations that he violated his oath of office and jeopardized U.S. national security by asking a foreign leader to investigate a political rival for personal gain. Williams, in her closed-door deposition, said that the call "shed some light on possible other motivations" for freezing nearly $400 million in military aid to Ukraine. She also said she viewed Trump's requests for investigations as politically motivated. "I found the specific references to be — to be more specific to the president in nature, to his personal political agenda, as opposed to a broader … foreign policy objective of the United States," Williams said.

UNITED STATES - NOVEMBER 07: Jennifer Williams, an aide to Vice President Mike Pence, arrives to the Capitol Visitor Center for a deposition related to House's impeachment inquiry on Thursday, November 7, 2019. Tom Williams | CQ-Roll Call, Inc. | Getty Images