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A look at former FBI director Robert Mueller

USA TODAY Logo USA TODAY | Slide 1 of 20: James Comey talks with Mueller before he was officially sworn in as FBI director on Sept. 4, 2013.

James Comey talks with former FBI director Robert Mueller before he was officially sworn in as FBI director on Sept. 4, 2013. Mueller was appointed special counsel Wednesday, a role in which he will look into Trump campaign ties to Russia as well as the president's firing of Comey.

© Susan Walsh, AP

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