Fiona Hill, the former White Hill official who is one of the foremost U.S. experts on Russia, is set to testify publicly Thursday as part of the Democratic-led impeachment inquiry into President Donald Trump.

Appearing to take aim at Republicans on the House Intelligence Committee, she will accuse lawmakers of echoing Russian propaganda by fomenting the "fictional narrative" that Ukraine meddled in the 2016 election, according to her prepared testimony obtained by NBC News.

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