The case challenged the lawfulness of the U.S. Trade Representative’s (USTR) actions in imposing the so-called “List 3” and “List 4A” tariffs under Section 301 of the Trade Act of 1974. After the U.S. Court of Appeals for the Federal Circuit upheld the tariffs in 2025, the plaintiffs sought Supreme Court review. By declining to hear the case, the Supreme Court leaves the Federal Circuit’s decision intact and effectively ends the challenge.

As a result, the legality of the List 3 and List 4A tariffs has been conclusively upheld, absent future legislative or administrative action. Importers that continue to source goods from China should therefore expect these Section 301 duties to remain in effect until further notice.

If you have questions regarding the impact of this decision or potential tariff mitigation strategies, please contact us.