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Secret Service Director Mark Sullivan and Charles K. Edwards, acting inspector general of the Department of Homeland Security, testify on Capitol Hill last year. The investigation was spurred by whistleblower accusations that Mr. Edwards was "susceptible to political pressure" in issuing a favorable investigative report on the Secret Service, according to a June 27 letter to him from the panel, and that his investigators "changed and withheld" information that would have been damaging to the service. (Associated Press)

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