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FILE - In this June 13, 2012, file photo then-FBI Director Robert Mueller listens as he testifies on Capitol Hill in Washington. Mueller took office as FBI director in 2001 expecting to dig into drug cases, white-collar misdeeds and violent crime. A week later was Sept. 11. Overnight, his mission changed and Mueller spent the next 12 years wrestling the agency into a battle-hardened terrorism-fighting force. (AP Photo/J. Scott Applewhite, File)