The Foreign Assistance Act of 1961 was amended by the Symington Amendment (Section 669 of the FAA) in 1976. It banned U.S. economic, and military assistance, and export credits to countries that deliver or receive, acquire or transfer nuclear enrichment technology when they do not comply with IAEA regulations and inspections. This provision, as amended, is now contained in Section 101 of the Arms Export Control Act (AECA).
The Glenn Amendment (Section 670) was later adopted in 1977, and provided the same sanctions against countries that acquire or transfer nuclear reprocessing technology or explode or transfer a nuclear device. This provision, as amended, is now contained in Section 102 of the Arms Export Control Act (AECA).
AECA Section 101
(a) PROHIBITIONS; SAFEGUARDS AND MANAGEMENT. —Except as provided in subsection (b) of this section, no funds made available to carry out the Foreign Assistance Act of 1961 or this Act may be used for the purpose of providing economic assistance (including assistance under chapter 4 of part II of the Foreign Assistance Act of 1961), providing military assistance or grant military education and training, providing assistance under chapter 6 of part II of that Act, or extending military credits or making guarantees, to any country which the President determines delivers nuclear enrichment equipment, materials, or technology to any other country on or after August 4, 1977, or receives such equipment, materials, or technology from any other country on or after August 4, 1977, unless before such delivery—
(1) the supplying country and receiving country have reached agreement to place all such equipment, materials, or technology, upon delivery, under multilateral auspices and management when available; and
(2) the recipient country has entered into an agreement with the International Atomic Energy Agency to place all such equipment, materials, technology, and all nuclear fuel and facilities in such country under the safeguards system of such Agency.
(b) CERTIFICATION BY PRESIDENT OF NECESSITY OF CONTINUED ASSISTANCE; DISAPPROVAL BY CONGRESS.—
(1) Notwithstanding subsection (a) of this section, the President may furnish assistance which would otherwise be prohibited under such subsection if he determines and certifies in writing to the Speaker of the House of Representatives and the Committee on Foreign Relations of the Senate that—
(A) the termination of such assistance would have a serious adverse effect on vital United States interests; and
(B) he has received reliable assurances that the country in question will not acquire or develop nuclear weapons or assist other nations in doing so. Such certification shall set forth the reasons supporting such determination in each particular case.
(2)(A) A certification under paragraph (1) of this subsection shall take effect on the date on which the certification is received by the Congress. However, if, within thirty calendar days after receiving this certification, the Congress enacts a joint resolution stating in substance that the Congress disapproves the furnishing of assistance pursuant to the certification, then upon the enactment of that resolution the certification shall cease to be effective and all deliveries of assistance furnished under the authority of that certification shall be suspended immediately.
(B) Any joint resolution under this paragraph shall be considered in the Senate in accordance with the provisions of section 601(b) of the International Security Assistance and Arms Export Control Act of 1976.