Whistlebower Says State Department Officials Threatened Her

She revealed criminal activity among staffers

A State Department whistle-blower says she was threatened after turning over documents to a U.S. senator that alleged coverups of investigations employee use of drugs and prostitutes, her lawyer says.

The whistle-blower's allegations have led lawmakers on Capitol Hill to look into whether the State Department squelched investigations into criminal behavior by employees, including an ambassador who allegedly propositioned prostitutes in a Belgian city park.

Rep. Ed Royce, chairman of the House Foreign Affairs Committee, sent a letter Tuesday to Secretary of State John Kerry asking for a briefing about the allegations detailed in recent news reports.