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19 U.S.C. 4516: Trade Representative authorityText contains those laws in effect through Public Law 119-120 (October 7, 2026).
From Title 19-CUSTOMS DUTIESCHAPTER 29-UNITED STATES–MEXICO–CANADA AGREEMENT IMPLEMENTATION
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§4516. Trade Representative authority

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.

( Pub. L. 116–113, title I, § 106 , Jan. 29, 2020 , 134 Stat. 19 .)