The Secretary of State shall be charged with the administration and the enforcement of the provisions of this chapter and all other immigration and nationality laws relating to (1) the powers, duties, and functions of diplomatic and consular officers of the United States, except those powers, duties, and functions conferred upon the consular officers relating to the granting or refusal of visas; (2) the powers, duties, and functions of the Administrator; and (3) the determination of nationality of a person not in the United States. He shall establish such regulations; prescribe such forms of reports, entries and other papers; issue such instructions; and perform such other acts as he deems necessary for carrying out such provisions. He is authorized to confer or impose upon any employee of the United States, with the consent of the head of the department or independent establishment under whose jurisdiction the employee is serving, any of the powers, functions, or duties conferred or imposed by this chapter or regulations issued thereunder upon officers or employees of the Department of State or of the American Foreign Service.