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Secret Service director to step down, announce retirement

Mark Sullivan, the director of the Secret Service, plans to step down and announce his retirement Friday after 30 years with the agency, administration sources say.

Sullivan has served as director since 2006 during the Bush administration. The agency found itself in the middle of a controversy after a prostitution scandal during President Obama's trip to Colombia in April 2012.

Wisconsin Republican Sen. Ron Johnson accused Sullivan of misleading Congress during a testimony in May of last year about the scandal, something other senators called "unfair."