The Chief of Protocol shall also maintain a roster of persons designated by the Secretary of State as official guests. Any inquiries by law enforcement officers or other persons as to whether a person has been so designated shall be directed to the Chief of Protocol. The designation of a person as an official guest is final. Pursuant to section 2658 of title 22 of the U.S.C., the authority of the Secretary of State to perform the function of designation of official guests is hereby delegated to the Chief of Protocol.