Section 301 investigations target allies and rivals alike as Washington races to rebuild its tariff toolkit before a July deadline
May 5th, 2026: Public hearings beginNew here? Follow stories to track developments over time. Create a free account to get updates when stories you care about change.
For thirteen months, the Trump administration imposed tariffs using emergency powers no president had claimed for that purpose. On February 20, the Supreme Court ruled 6-3 that those tariffs were illegal.
Three weeks later, the administration launched Section 301 investigations into 16 economies: China, the European Union, Japan, India, Mexico, and eleven others. They allege these countries' industrial policies create excess manufacturing capacity in more than twenty sectors—steel, semiconductors, batteries, robotics—that undercuts American producers. These investigations are the administration's primary legal strategy for restoring tariff authority after the court defeat.
A temporary 10% global tariff under Section 122 of the Trade Act expires July 24, 2026; Congress has shown no inclination to extend it. By contrast, Section 301 has no rate cap or expiration date, backed by decades of precedent. If the investigations conclude these countries' policies burden American commerce, the administration could impose higher tariffs by summer—just as the stopgap runs out.
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"The court forbids the king his cudgel, so the king fetches a longer one from the shed — and calls it justice."
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"They lost in court, so naturally they opened sixteen more courts of their own — one does admire a man who, told he cannot have the cake, simply builds a bakery."
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The agency responsible for developing and coordinating U.S. international trade policy, including negotiating trade agreements and enforcing trade laws.
The executive branch of the European Union, responsible for trade policy on behalf of 27 member states.
February 2025 May 2026
USTR scheduled public hearings to receive testimony from interested parties on the manufacturing overcapacity allegations.
USTR opened the public comment period for all 16 investigations, with written submissions due by April 15.
USTR Greer announced investigations into China, the EU, India, Japan, South Korea, Mexico, Taiwan, and nine other economies over structural excess manufacturing capacity across more than 20 industrial sectors.
In Learning Resources Inc. v. Trump, the court ruled that IEEPA does not authorize presidential tariffs. Within hours, the White House imposed a replacement 10% global tariff under Section 122 of the Trade Act, which expires after 150 days.
The U.S. Court of Appeals affirmed the lower court's decision that IEEPA does not authorize tariffs, sending the case toward the Supreme Court.
Washington and Brussels agreed to cap EU tariffs at 15% in exchange for EU commitments to purchase $750 billion in U.S. energy and invest $600 billion in the United States by 2028.
The U.S. Court of International Trade unanimously ruled that IEEPA does not authorize the president to impose tariffs, the first judicial check on the tariff program.
Trump announced a universal 10% tariff with higher rates up to 50% on specific trading partners based on trade balances, all under IEEPA authority.
President Trump signed executive orders imposing 25% tariffs on Canada and Mexico and 10% on China using the International Emergency Economic Powers Act, a statute never before used for tariffs.
3 moments from history that rhyme with this story — and how they unfolded.
President Reagan imposed 100% tariffs on $300 million worth of Japanese electronics after concluding that Japan had violated a 1986 semiconductor trade agreement by dumping chips in third-country markets and restricting American access to Japan's semiconductor market. It was the most aggressive use of Section 301 up to that point.
Japan made concessions on market access, and Reagan lifted most tariffs by November 1987.
A new semiconductor agreement was reached in 1991. Japan's semiconductor market share declined over the following decade, while the episode established Section 301 as a credible enforcement tool against major trading partners.
The 1987 case demonstrated that Section 301 can produce results against allied economies, not just adversaries. The current probes similarly target U.S. allies—Japan, the EU, South Korea—alongside China, using the same legal authority.
USTR launched a Section 301 investigation into China's practices regarding technology transfer, intellectual property, and innovation. The findings led to tariffs on over $300 billion in Chinese goods at rates of 7.5% to 25%, imposed in four waves between July 2018 and September 2019.
China retaliated with tariffs on U.S. agricultural and manufactured goods. A Phase 1 trade deal in January 2020 paused escalation but left most tariffs in place.
The tariffs persisted through the Biden administration, which raised some rates further in 2024. The Federal Circuit upheld their legality in 2024, establishing that Section 301 tariffs can survive judicial review.
The 2018 China investigation is the direct legal and strategic template for the current probes. It proved that Section 301 can sustain tariffs of this scale, and the same office—now led by Greer, who served as Lighthizer's chief of staff during the original investigation—is running these new probes.
Congress raised tariffs on over 20,000 imported goods to shield American industries during the Great Depression. Thirty-five governments formally protested. Canada, France, and other trading partners imposed retaliatory tariffs within months.
Global trade collapsed by 66% between 1929 and 1934. U.S. exports to retaliating nations fell 28-32%.
The backlash led to the Reciprocal Trade Agreements Act of 1934, which shifted tariff-setting authority from Congress to the executive branch—the same framework the current administration is now navigating.
Smoot-Hawley is the cautionary precedent for broad, simultaneous tariff action against many trading partners at once. The current probes target 16 economies representing the vast majority of U.S. trade, raising similar questions about coordinated retaliation and supply chain disruption.