WASHINGTON — A top lawmaker briefed on the investigation into a Secret Service prostitution scandal predicted more firings would follow the forced ouster of three agency employees.

“I wouldn’t be surprised if you saw more dismissals and more being forced out sooner rather than later,” Rep. Peter King, R-N.Y., said this morning. King is being updated on the investigation by Secret Service Director Mark Sullivan.

The Secret Service is moving quickly to quell the scandal that erupted late last week, when at least some of 11 agency employees implicated in the incident brought prostitutes back to their hotel in Cartagena, Colombia, where they were setting up security for a visit by President Barack Obama.

So far, three people involved have lost their jobs. The service said Wednesday that one supervisor was allowed to retire, and another will be fired for cause. A third employee, who was not a supervisor, has resigned.