Sidney Blumenthal (L), a longtime Hillary Clinton friend who was an unofficial adviser while she was secretary of state, arrives to be deposed in private session of the House Select Committee on Benghazi at the U.S. Capitol in Washington June 16, 2015. Congressional investigators had issued a subpoena seeking testimony from Blumenthal because he emailed private intelligence reports to Clinton on events in Libya before and after the deadly attacks by militants that killed four Americans including U.S. Ambassador to Libya Chris Stevens. REUTERS/Jonathan Ernst -