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Robert Mueller, former director of the Federal Bureau of Investigation (FBI), speaks during a Bloomberg Government cybersecurity conference in Washington, D.C., U.S., on Tuesday, June 3, 2014. The conference was titled "Cybersecurity: Getting to Business." Photographer: Andrew Harrer/Bloomberg via Getty Images

Robert Mueller, former director of the Federal Bureau of Investigation (FBI), speaks during a Bloomberg Government cybersecurity conference in Washington, D.C., U.S., on Tuesday, June 3, 2014. The conference was titled "Cybersecurity: Getting to Business." Photographer: Andrew Harrer/Bloomberg via Getty Images