Public hearing scheduled on Secret Service prostitution scandal May 13, 2012 -- Updated 1433 GMT (2233 HKT) The hearing will take place May 23, Lieberman says The Secret Service director will testify, he says (CNN) -- The Senate Homeland Security Committee has scheduled a public hearing on the prostitution scandal involving U.S. military and Secret Service agents in Colombia. The hearing will take place May 23, Sen. Joe Lieberman, the committee chairman, told CNN's "State of the Union." Secret Service Director Mark Sullivan and Acting Inspector General Charles Edwards will testify, Lieberman said. The committee will ask whether Sullivan is satisfied with the investigation into what occurred in Cartagena, Colombia, Lieberman said. Secondly, Lieberman said, the committee will ask, "Were there indications before the Colombian scandal of behavior by Secret Service agents off duty on assignment that should have been a warning that this was coming?" And third, what are you going to do, Director Sullivan, to make sure that nothing like this ever happens again. The incident was "heartbreaking" and "dangerous," Lieberman said.