FBI Director Robert Mueller testifies on Capitol Hill in Washington, Wednesday, June 19, 2013, before the Senate Judiciary Committee hearing on national security matters. As Mueller nears the end of his 12 years as head of the law enforcement agency, lawmakers questioned him about the IRS, surveillance activities, and the Boston Marathon bombing. (AP Photo/J. Scott Applewhite)

Associated Press
FBI Director Robert Mueller testifies on Capitol Hill in Washington, Wednesday, June 19, 2013, before the Senate Judiciary Committee hearing on national security matters. As Mueller nears the end of his 12 years as head of the law enforcement agency, lawmakers questioned him about the IRS, surveillance activities, and the Boston Marathon bombing. (AP Photo/J. Scott Applewhite)
FBI Director Robert Mueller testifies on Capitol Hill in Washington, Wednesday, June 19, 2013, before the Senate Judiciary Committee hearing on national security matters. As Mueller nears the end of his 12 years as head of the law enforcement agency, lawmakers questioned him about the IRS, surveillance activities, and the Boston Marathon bombing. (AP Photo/J. Scott Applewhite)
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