19 USC 4516
19 USC 4516
§ 4516 - Trade Representative authority
CHAPTER 29— UNITED STATES–MEXICO–CANADA AGREEMENT IMPLEMENTATION › SUBCHAPTER I— APPROVAL OF, AND GENERAL PROVISIONS RELATING TO, THE USMCA
If a country (other than the United States) that has signed the USMCA does not enact implementing legislation, the Trade Representative is authorized to enter into negotiations with the other country that has signed the USMCA to consider how the applicable provisions of the USMCA can come into force with respect to the United States and that other country as promptly as possible.