By Greg Seaby and Carol Cratty

Misconduct with prostitutes by U.S. Secret Service agents handling travel security for the president in April was not a one-off episode, according to a media report citing an investigation by the Department of Homeland Security.

Sen. Joseph Lieberman, chairman of the Homeland Security and Governmental Affairs Committee, issued a statement Friday complaining about unfair "selective leaks" and said he will wait for the final report "before making any judgments."

The Homeland Security inspector general's results "contradict" previous testimony before Congress by Secret Service Director Mark Sullivan about the incident during President Obama's trip to Colombia to attend the Summit of the Americas, ABC News reported Thursday.

But a Secret Service official with knowledge of the investigation told CNN on Thursday that Sullivan's statements in a hearing in May had been "truthful."

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