Secret Service Director Mark Sullivan says an agent was fired in 2008 after being caught in a Washington prostitution scandal.
Sullivan told a Senate panel that the on-duty agent was caught trying to hire an undercover police officer and was "separated from the agency" a month later.
Sullivan is testifying before the Senate Homeland Security and Governmental Affairs Committee about the Colombia prostitution scandal that erupted after an officer and a Colombia prostitute argued over payment at a Cartagena hotel last month.
In his first public statements about the scandal, Sullivan apologized for the employees' behavior.
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