19 U.S.C. § 2511: General authority to modify discriminatory purchasing requirements

to United States products and suppliers of such products; or to eligible products of another foreign country or instrumentality which is a party to the Agreement and suppliers of such products. is a country or instrumentality which (A) has become a party to the Agreement or the USMCA (as defined in section 4502 of this title ), and (B) will provide appropriate reciprocal competitive government procurement opportunities to United States products and suppliers of such products; is a country or instrumentality, other than a major industrial country, which (A) will otherwise assume the obligations of the Agreement, and (B) will provide such opportunities to such products and suppliers; is a country or instrumentality, other than a major industrial country, which will provide such opportunities to such products and suppliers; or is a least developed country. The President may modify or withdraw any waiver granted pursuant to subsection (a) or designation made pursuant to subsection (b). Notwithstanding any other provision of law, the President may direct any agency of the United States listed in Annex 13–A of the USMCA (as defined in section 4502 of this title ) to procure eligible products in compliance with the procedural provisions of chapter 13 of the USMCA. The authority of the President under subsection (a) of this section to waive any law, regulation, procedure, or practice regarding Government procurement does not authorize the waiver of any small business or minority preference. take effect on the date on which the USMCA enters into force [ July 1, 2020 ]; and apply with respect to a procurement on or after that date. the amendments made by subsections (a) and (b) to sections 301 and 308 of the Trade Agreements Act of 1979 ( 19 U.S.C. 2511 and 2518) shall not apply with respect to the contract; and sections 301 and 308 of such Act, as in effect on the day before that date, shall continue to apply on and after that date with respect to the contract.” the authority of the President to grant waivers under section 303 [ section 2513 of this title ] shall be effective on January 1, 1980 ; and the authority of the President to grant waivers under section 301 [this section] shall be effective on January 1, 1981 .”