On June 15, 2026, the U.S. Supreme Court denied a petition, led by HTMX Industries, to overturn the U.S. Court of Appeals for the Federal Circuit's decision upholding the lists 3 and 4A Section 301 China tariffs imposed by President Trump during his first administration.

The Federal Circuit upheld the tariffs in a ruling handed down in September 2025. The Federal Circuit held that the duties were a valid exercise of authority under Section 307(a)(1)(C) of the Trade Act of 1974. The petitioners had argued that the government abused “Section 307’s modest ‘modification’ power” and will likely continue to abuse the power with future Section 301 tariffs.

For further information about this and other Customs matters, contact George Tuttle III at geo@tuttlelaw.com or 415-986-8780.

The information in this article is general in nature and is not intended to constitute legal advice or to create an attorney-client relationship with respect to any event or occurrence and may not be considered as such.

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