Before stepping down in August 2017, FBI agent Peter Strzok led Hillary Clinton's email investigation, and later led the bureau's investigation into Russian interference in the 2016 election.

He's also become a target of Republicans for unearthed text messages that show him and his then-partner criticizing President Trump and dismissing his chances of winning the White House. That's led some, including the president himself, to assert that Strzok was derelict in his duty.

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