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Photo: Chip Somodevilla/Getty Images

In a tweet Sunday, President Trump attacked Jennifer Williams, an aide to Vice President Mike Pence, for her testimony in a closed-door impeachment hearing, calling her a "Never Trumper" while also claiming he doesn't know who she is.

The big picture: Over the past few weeks, the president has continually claimed that he does not know several of the key people involved in the impeachment inquiry — despite them serving in his own administration.

Lt. Col. Alexander Vindman: On the morning of the impeachment testimony from the National Security Council's top Ukraine expert, Trump said in a tweet, "Why are people that I never even heard of testifying about the [July telephone call between Trump and Ukrainian President Volodymyr Zelensky]."

  • Vindman, who was the first person to directly listen to the call to testify before the House committees, said that acting White House chief of staff Mick Mulvaney "coordinated" a plan to condition a White House meeting for Zelensky on an investigation into the Bidens.

Former Ukraine Ambassador Marie Yovanovitch: Trump said earlier this week that he "really [doesn't] know her" on the same day the House released its transcript of her testimony.

  • She testified that Trump's lawyer Rudy Giuliani led a campaign to oust her over unsubstantiated allegations that she badmouthed the president and was seeking to stop Ukraine from opening an investigation into the Bidens.

Bill Taylor, the top U.S. diplomat in Ukraine: Trump said in a tweet last month that he doesn't know Taylor — and called the career diplomat a "Never Trumper."

  • Taylor told the impeachment committees that he understood the president to be conditioning the release of military aid on the Ukrainian president's willingness to announce investigations into Trump's political rivals, including the Bidens.

Lev Parnas and Igor Fruman: Trump told reporters last month that he didn't know the pair, who are business associates of Rudy Giuliani with ties to Ukraine and are facing charges for allegedly funneling foreign money into Republican political campaigns.

  • Earlier this week, Parnas indicated that he would be willing to comply with the impeachment inquiry. His lawyer said that he "was very upset by President Trump’s plainly false statement that he did not know him."

EU Ambassador Gordon Sondland: Trump told reporters at the White House that he "hardly [knows]" Sondland, who donated $1 million to Trump's inaugural committee.

  • Sondland revised his closed-door testimony to reflect that he told an aide to Ukrainian President Volodymyr Zelensky that military assistance would not be released until Zelensky issued a statement agreeing to investigate Burisma, a gas company with ties to Biden's son.

Jennifer Williams: Trump tweeted "whoever that is" when referring to Williams, who serves as an adviser to Vice President Mike Pence on Europe and Russia.

  • Williams testified that Trump's call with Zelensky — which she listened in on — was "unusual and inappropriate," and that it "shed some light on possible other motivations behind a security assistance hold."

Go deeper:

Go deeper

NASA estimates Tonga volcano exploded with force of 5-6 megatons

A satellite image of Hunga Tonga Hunga Ha’apai volcano on Dec. 24, before the eruption. Photo: Satellite image ©2022 Maxar Technologies

NASA scientists estimate the power of Tonga's volcanic eruption over the weekend to have been 5-6 Megatons of TNT equivalent.

Threat level: Saturday's eruption of the Hunga Tonga Hunga Haʻapai volcano and subsequent tsunami killed at least three people. Scientists warn an "ash-seawater cocktail" poses a potentially toxic health threat, and drinking water could be contaminated.

Updated 3 hours ago - Politics & Policy

New York AG alleges "significant evidence" of Trump Organization fraud

Combination images of former President Trump and New York State Attorney General Letitia James. Photo: Al Drago/Bloomberg via Getty Images; Scott Heins/Getty Images

New York's attorney general filed a motion Tuesday seeking to compel former President Trump and his two elder children to appear for sworn testimony in her office's civil investigation into the Trump Organization's financial dealings.

Why it matters: Attorney General Letitia James revealed new details in the court filing and a statement on her office's investigation into the Trump Organization's business practices, including a preliminary finding alleging the company used "fraudulent and misleading asset valuations to obtain economic benefits."

5 hours ago - Technology

Ex-N.Y. Post digital chief files lawsuit alleging sexual harassment

Richard B. Levine) (Photo by Richard Levine/Corbis via Getty Images

Former New York Post editor Michelle Gotthelf is suing her former employer, its parent company News Corp. and two editors, alleging she was reprimanded after complaining to senior executives that she was sexually harassed by retired N.Y. Post editor-in-chief Col Allan. The N.Y. Post issued a statement denying any wrongdoing.

Why it matters: "I felt that I owed it to myself and I owed it to the news organization and the people who answered to me," Gotthelf, who was a long time editor at the N.Y. Post, told Axios in an interview.