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WATCH: Yovanovitch testifies she was not given a reason for her firing

Former U.S. Ambassador to Ukraine Marie Yovanovitch says she was told last April by a State Department official to return to the United States “on the next plane” because of concerns “up the street” — a phrase she understood to mean the White House.

Yovanovitch spoke on Nov. 15 as part of the impeachment hearings into President Donald Trump. Watch in the player above.

Yovanovitch said she received the call at 1 a.m. from an official who said she needed to come home right away. The person said there were concerns about her security.

READ MORE: A guide to the impeachment hearings

She asked if that meant her physical security. The person said no.

Yovanovitch said this was “extremely irregular” and she argued. But she eventually returned, where she learned that President Donald Trump no longer wanted her to serve.