22 U.S.C. § 1928f

(a) Opposition of Congress to suspension, termination, denunciation, or withdrawal from North Atlantic Treaty The President shall not suspend, terminate, denounce, or withdraw the United States from the North Atlantic Treaty, done at Washington, DC, April 4, 1949 , except by and with the advice and consent of the Senate, provided that two-thirds of the Senators present concur, or pursuant to an Act of Congress. (b) Limitation on the use of funds No funds authorized or appropriated by any Act may be used to support, directly or indirectly, any decision on the part of any United States Government official to suspend, terminate, denounce, or withdraw the United States from the North Atlantic Treaty, done at Washington, DC, April 4, 1949 , except by and with the advice and consent of the Senate, provided that two-thirds of the Senators present concur, or pursuant to an Act of Congress. (c) Notification of Treaty action (1) Consultation Prior to the notification described in paragraph (2), the President shall consult with the Committee on Foreign Relations of the Senate and the Committee on Foreign Affairs of the House of Representatives in relation to any initiative to suspend, terminate, denounce, or withdraw the United States from the North Atlantic Treaty. (2) Notification The President shall notify the Committee on Foreign Relations of the Senate and the Committee on Foreign Affairs of the House of Representatives in writing of any deliberation or decision to suspend, terminate, denounce, or withdraw the United States from the North Atlantic Treaty, as soon as possible but in no event later than 180 days prior to taking such action. (d) Rule of construction Nothing in this section shall be construed to authorize, imply, or otherwise indicate that the President may suspend, terminate, denounce, or withdraw from any treaty to which the Senate has provided its advice and consent without the advice and consent of the Senate to such act or pursuant to an Act of Congress. (e) Severability If any provision of this section or the application of such provision is held by a Federal court to be unconstitutional, the remainder of this subtitle and the application of such provisions to any other person or circumstance shall not be affected thereby. (f) Definitions In this subtitle, the terms “withdrawal”, “denunciation”, “suspension”, and “termination” have the meaning given the terms in the Vienna Convention on the Law of Treaties, concluded at Vienna May 23, 1969 .