Washington -- The Senate Homeland Security Committee will hold a public hearing this Wednesday on the prostitution scandal involving U-S military and Secret Service agents in Colombia.
The incident happened last month in advance of President Obama's trip to the Summit of the Americas.
It involved roughly 20 alleged prostitutes, and has so far resulted in the dismissal of nine Secret Service members.
Three other Secret Service agents were cleared of serious misconduct.
Agency heads are expected to testify.