"In this Oct. 11, 2019, file photo, former U.S. ambassador to Ukraine Marie Yovanovitch, arrives on Capitol Hill in Washington. The House will hear from a singular witness Friday in the Trump impeachment hearings, Yovanovitch, who was targeted by the president's allies in a ""smear"" campaign now central to the inquiry. (AP Photo/J. Scott Applewhite, File)"
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