Secret Service chief to testify on prostitute scandal

WASHINGTON -- The head of the Secret Service testifies for the first time Wednesday about the humiliating prostitution scandal in Colombia that tarnished his agency's reputation.

Mark Sullivan is likely to be asked whether the incident was an isolated case or part of a pattern of bad behavior. But don't expect lawmakers to demand Sullivan's walking papers.

Sullivan has repeatedly briefed key lawmakers on the salacious details of the incident in closed-door meetings since the scandal broke in April.

Wednesday's hearing in front of the Senate Homeland Security and Governmental Affairs Committee will be the first since the incident became public after a morning-after argument over money between a Colombian prostitute and her Secret Service agent client.