In a landmark decision on Friday, the U.S. Supreme Court struck down President Donald Trump’s sweeping global tariff program, ruling 6–3 that he exceeded his constitutional authority by imposing broad import duties without explicit congressional authorization.
Chief Justice John Roberts, writing for the majority, held that the International Emergency Economic Powers Act (IEEPA)—the law Trump relied on—does not empower the president to impose tariffs on imports from around the world during peacetime. The ruling reaffirmed that only Congress has the power to impose taxes and tariffs, underscoring the constitutional system of checks and balances.
Supporters of the decision, including Democratic lawmakers and business groups, hailed the ruling as a victory for the rule of law and a relief for U.S. companies and consumers who have been squeezed by higher import costs. Markets reacted positively, with major U.S. stock indexes climbing on the news as uncertainty over tariff-driven supply-chain disruption eased.
President Trump’s reaction was swift and combative. Within hours of the court’s decision, he signed an executive order imposing a new 10% global tariff under Section 122 of the Trade Act of 1974, which allows temporary tariffs for up to 150 days to address balance-of-payments issues, a legal authority separate from IEEPA. Trump also vowed that national security tariffs under Section 232 and retaliation measures under Section 301 will remain fully in place, signaling that his broader approach to trade protectionism remains intact.
At a news conference, Trump blasted the Supreme Court’s ruling as “deeply disappointing” and even “a disgrace to the nation,” accusing some justices of undermining U.S. interests and pledging to pursue other tools to defend American manufacturers and workers. He told reporters that tariffs could even “potentially go higher” depending on how trade negotiations evolve.
Internationally, trade partners have expressed cautious relief that the legal basis for many U.S. tariffs was curtailed, though questions remain about how the new Section 122 levies will affect export flows. Some analysts say that even with the Supreme Court setback, Trump’s trade agenda remains disruptive, given that alternative legal authorities can be invoked to maintain or reintroduce duties on a wide range of goods.
Economists have warned that enduring tariff measures, regardless of legal framework, could continue to disrupt global supply chains and contribute to price pressures in key sectors. Governments in Canada, the European Union, and Asia are reviewing how to respond to shifting U.S. trade policy while safeguarding their own industries.
Implications for global trade
The Supreme Court’s decision has complex implications for the future of U.S. tariff policy and global economic relations. On one hand, it reasserts congressional oversight over trade, limiting the executive’s ability to unilaterally impose broad duties without legislative backing. This could rein in sudden tariff escalations that have rattled global markets. On the other hand, Trump’s immediate use of alternative laws shows that presidential trade tools are not eliminated, only reframed with more legal constraints and time limits that may invite further litigation or require congressional action to sustain longer-term tariffs.
For global trade, the ruling may calm some sellers and buyers by curtailing the most expansive U.S. tariff measures, but uncertainty persists. Traders and multinational firms are now watching whether Congress will intervene to codify or curb presidential tariff powers, and how trading partners will pivot in ongoing negotiations. Economists caution that a drawn-out period of shifting legal authority and policy experimentation may continue to strain international commerce, investment flows, and long-term trade agreements between the United States and its economic partners.