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Andrew Peek, the senior director for European and Russian affairs at the National Security Council, has been placed on administrative leave pending a security-related investigation, people familiar with the situation tell Axios.

Driving the news: Peek had been expected to attend the World Economic Forum in Davos, Switzerland next week, where President Trump is expected to meet with a number of world leaders as the impeachment trial takes place back in the Senate.

  • Peek declined to comment.
  • White House and National Security Council officials declined to discuss the situation. "We do not discuss personnel matters," the NSC said in a statement to Axios.

Why it matters: Peek's responsibilities at the NSC, and before that at the State Department, touch on a number of sensitive areas. He took on the same role as impeachment witnesses Fiona Hill and Tim Morrison.

  • He joined the NSC in November after serving as a deputy assistant secretary at the State Department, where he focused on Iraq and Iran.
  • He previously served as a strategic adviser to now-retired Marine Gen. John Allen when Allen was commander of the NATO-led International Security Assistance Force in Afghanistan.

Go deeper: NSC staffer denies having secret Ukraine conversations with Trump

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What she's saying: "I don't have confidence in anyone who stands there while the president says, 'Swallow Lysol and it's going to cure your virus,'" Pelosi told host Jim Scuitto.

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Illustration: Aïda Amer/Axios

While its Big Tech rivals were testifying in front of a congressional antitrust committee last week, Microsoft was negotiating what could be the largest — and most politically perilous — tech acquisition of 2020.

The state of play: The hullabaloo surrounding Microsoft picking up TikTok has undergone a flurry of twists and turns over the weekend, as both the White House and the tech giant reacted in real time.