National Command authority - wikipedia National Command authority National Command Authority ( NCA ) is a term used by the Department of Defense of the United States of America to refer to the ultimate source of lawful military orders. The NCA comprises the President of the United States ( as commander - in - chief ) and the Secretary of Defense jointly, or their duly deputized successors, i.e. the Vice President and the Deputy Secretary of Defense. The term also refers to communications with the commanding officers of the Unified Combatant Commands to put U.S. forces into action. Authorization of a nuclear or strategic attack Only the President can direct the use of nuclear weapons by U.S. armed forces, including the Single Integrated Operational Plan ( SIOP ). While the President does have unilateral authority as commander - in - chief to order that nuclear weapons be used for any reason at any time, the actual procedures and technical systems in place for authorizing the execution of a launch order requires a secondary confirmation under a two - man rule, as the President 's order is subject to secondary confirmation by the Secretary of Defense. If the Secretary of Defense does not concur, then the President may in his sole discretion fire the Secretary. The Secretary of Defense has legal authority to approve the order, but can not veto it. See also Designated survivor United States Strategic Command Goldwater -- Nichols Act Notes and references Jump up ^ If the President fires the Secretary, then the Chairman of the Joint Chiefs of Staff will look to the Deputy Secretary of Defense to confirm that a nuclear strike is warranted. He will not pass a nuclear strike order to the operating forces unless the two - man rule has been followed. Beauchamp, Zack ( August 3, 2016 ). `` If President Trump Decided to Use Nukes, He Could Do It Easily ''. Vox. Retrieved October 2, 2016. Jump up ^ Blair, Bruce ( June 11, 2016 ). `` What Exactly Would It Mean to Have Trump 's Finger on the Nuclear Button ? ''. Politico Magazine. Retrieved October 2, 2016. Jump up ^ Broad, William J. ; Sanger, David E. ( August 4, 2016 ). `` Debate Over Trump 's Fitness Raises Issue of Checks on Nuclear Power ''. The New York Times. p. A1. Retrieved October 2, 2016. Retrieved from `` https://en.wikipedia.org/w/index.php?title=National_Command_Authority&oldid=794821913 '' Categories : Presidency of the United States Command and control in the United States Department of Defense Continuity of government in the United States Talk About Wikipedia Deutsch Français 日本 語 Edit links This page was last edited on 10 August 2017, at 07 : 14. About Wikipedia

Question: who has the power to launch nuclear weapons in the us
Answer: Only the President