EXCLUSIVE — U.S. government documents seen by the Washington Examiner raise serious questions of continuing mismanagement by senior ranks of the Diplomatic Security Service.

The State Department’s law enforcement and security agency, DSS, is responsible for protecting Secretary of State Marco Rubio, the U.S. ambassador to the United Nations, certain visiting dignitaries, and U.S. diplomats and diplomatic facilities abroad. It also investigates certain federal crimes, such as passport and visa fraud. But DSS has faced significant challenges in recent years.