Fiona Hill, the National Security Council's former senior director for Europe and Russia, arrives on Capitol Hill on Nov. 21, 2019.
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Fiona Hill was a key witness at Donald Trump's first impeachment hearing. Now she's warning about the threat to American democracy that comes from within. Her memoir is There Is Nothing for You Here.
Fiona Hill, the National Security Council's former senior director for Europe and Russia, arrives on Capitol Hill on Nov. 21, 2019.
Chip Somodevilla/Getty Images
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