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Photo: Mark Wilson/Getty Images

In a tweet on Sunday, President Trump attacked Jennifer Williams, an aide to Vice President Mike Pence, for her closed-door testimony in the impeachment inquiry, calling her a "Never Trumper."

"Tell Jennifer Williams, whoever that is, to read BOTH transcripts of the presidential calls, & see the just released ststement [sic] from Ukraine. 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!"

The backdrop: Williams is a longtime State Department employee who is currently detailed as a special adviser to Pence on Europe and Russia.

  • Williams testified that Trump's July 25 call with Ukrainian President Volodymyr 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."
  • Williams also testified that Zelensky had specifically mentioned Burisma during the call, which was not reflected in the White House memorandum of the call.
“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."
— Jennifer Williams told investigators

The big picture: Williams is not the only career official and impeachment witness who President Trump has attacked or denied knowing, despite the fact that they serve in his administration. He has also lobbed insults at top U.S. diplomat in Ukraine Bill Taylor, former Ambassador to Ukraine Marie Yovanovitch and National Security Council official Lt. Col. Alexander Vindman.

What to watch: Williams is expected to testify in a public impeachment hearing on Tuesday.

Go deeper:

Go deeper

Updated 3 hours ago - Sports

Olympics dashboard

Katie Ledecky in Tokyo. Photo: Ding Xu/Xinhua via Getty Images

🚨: Simone Biles won't compete in individual vault or uneven bars

🏊‍♀️: Katie Ledecky wins gold in women's 800m freestyle

🏊: Caeleb Dressel breaks world record in men's 100m butterfly, 3rd gold

🇬🇧: Britain wins gold in first-ever Olympic mixed 4x100m medley relay

🎾: Novak Djokovic defeated in Olympic semi-finals

💻: Japan tests teleporting games and "remote cheering"

Go deeper: Full Axios coverage

Updated 4 hours ago - Sports

Simone Biles won't compete in individual vault or uneven bars Olympic finals

Photo: Loic Venance/AFP via Getty Images

Simone Biles will not compete in the individual vault or uneven bars finals at the Tokyo Olympics, USA Gymnastics announced Friday.

Why it matters: USA Gymnastics said Biles, who previously withdrew from the individual all-around and team finals to prioritize her mental health, will continue to be evaluated to determine if she'll compete in the balance beam or floor exercise events.

5 hours ago - Sports

American Katie Ledecky wins Olympic gold in women's 800m freestyle

USA's Katie Ledecky reacts after taking gold in the final of the women's 800m freestyle race. Photo: Odd Anderson/AFP via Getty Images

American superstar swimmer Katie Ledecky grabbed her second gold medal of this year's Olympic Games, winning the women's 800-meter freestyle race Saturday in Tokyo.

Driving the news: Ledecky, who holds the world record in the 800m freestyle, is considered one of the best women swimmers of all time. Saturday's final marks her third straight Olympic gold in the event.