47 C.F.R. § 201.3
(b) The President has limited non-wartime NS/EP telecommunications functions, and wartime NS/EP functions under the Communications Act of 1934 (as amended), which have been delegated to Federal agencies under Executive Order 12472. Federal, State, and local governments share the responsibility for conservation of the Nation's telecommunications resources.
(e) The President also is authorized, during war, when necessary in the interest of national defense and security, to direct or establish priorities for essential communications with any commercial or governmental carrier and to prevent obstruction of telecommunications. The President may also suspend or amend rules and regulations, close stations and facilities, and authorize U.S. government use and control of telecommunications resources with regard to: