United States Code/Title 3/Chapter 4
The President of the United States is authorized to designate and empower the head of any department or agency in the executive branch, or any official thereof who is required to be appointed by and with the advice and consent of the Senate, to perform without approval, ratification, or other action by the President
- (1) any function which is vested in the President by law, or
- (2) any function which such officer is required or authorized by law to perform only with or subject to the approval, ratification, or other action of the President: Provided, That nothing contained herein shall relieve the President of his responsibility in office for the acts of any such head or other official designated by him to perform such functions. Such designation and authorization shall be in writing, shall be published in the Federal Register, shall be subject to such terms, conditions, and limitations as the President may deem advisable, and shall be revocable at any time by the President in whole or in part.
§ 302. Scope of delegation of functions 
The authority conferred by this chapter shall apply to any function vested in the President by law if such law does not affirmatively prohibit delegation of the performance of such function as herein provided for, or specifically designate the officer or officers to whom it may be delegated. This chapter shall not be deemed to limit or derogate from any existing or inherent right of the President to delegate the performance of functions vested in him by law, and nothing herein shall be deemed to require express authorization in any case in which such an official would be presumed in law to have acted by authority or direction of the President.
§ 303. Definitions 
As used in this chapter, the term “function” embraces any duty, power, responsibility, authority, or discretion vested in the President or other officer concerned, and the terms “perform” and “performance” may be construed to mean “exercise”.