On August 29, 2025, the U.S. Court of Appeals for the Federal Circuit ruled 7-4 that most of President Donald Trump’s tariffs, imposed under the International Emergency Economic Powers Act (IEEPA), are illegal, marking a significant blow to his trade policy. The decision, which declared the tariffs “invalid as contrary to law,” emphasized that the power to impose tariffs lies with Congress, not the president. The ruling, affecting Trump’s “reciprocal” tariffs and levies on China, Canada, and Mexico, sets the stage for a potential Supreme Court battle that could redefine executive authority over trade.
Legal Challenge to Trump’s Tariffs
The court’s decision addressed tariffs enacted through Trump’s 2024 executive orders, which imposed a 10% baseline tariff on nearly all countries and additional “reciprocal” tariffs targeting nations like China, Canada, and Mexico. These measures, justified by Trump under the IEEPA—a 1977 law allowing economic actions during national emergencies—were challenged by small businesses and 12 Democratic-led U.S. states. The lawsuits argued that the IEEPA does not authorize tariffs, as the Constitution grants Congress exclusive authority over taxation and trade.
The majority opinion stated, “The IEEPA does not grant the president wide-ranging authority to impose tariffs, which remain a core Congressional power.” The ruling upheld a May 2025 decision by the U.S. Court of International Trade, which had also deemed the tariffs unlawful but was stayed pending appeal. Notably, the decision does not affect tariffs imposed under other laws, such as those on steel and aluminum under Section 232 of the Trade Expansion Act.
Trump’s Response and Administration’s Defense
President Trump swiftly criticized the ruling on Truth Social, labeling the court “highly partisan” and warning that removing the tariffs would “literally destroy the United States of America.” He argued that the levies were vital for economic strength and national security, claiming they generated over $125 billion in revenue and secured trade concessions from partners like the European Union and Japan.
The Trump administration’s legal team had cautioned that overturning the tariffs could lead to a financial collapse akin to the 1929 stock market crash, emphasizing their role in protecting U.S. interests. Treasury Secretary Scott Bessent and other officials warned of “di(ch)plomatic embarrassment” and disruptions to ongoing trade negotiations if the tariffs were invalidated.
Implications and Next Steps
The ruling, set to take effect on October 14, 2025, unless overturned, pauses the tariffs temporarily to allow the administration to appeal to the U.S. Supreme Court. The case is poised to test the limits of presidential power, particularly given the Supreme Court’s recent skepticism of expansive executive actions without clear congressional authorization. With six of nine justices appointed by Republicans, including three by Trump, the court’s decision could significantly influence future trade policy.
The dissenting judges, led by Chief Judge Kimberly Moore, argued that the IEEPA permits tariffs as part of regulating importation during emergencies. However, the majority held that the law lacks explicit tariff authority and that Trump’s broad application exceeded legal bounds. The decision could unravel trade deals negotiated under the tariffs, prompting allies like the EU and Japan to reassess agreements.
Broader Context
The ruling reflects a broader tension between executive and congressional powers, especially as Trump has leveraged tariffs to reshape global trade and alliances. While the administration may pursue alternative legal avenues, such as Section 301 of the Trade Act, to impose tariffs, the decision underscores the judiciary’s role in checking executive overreach. As the case heads to the Supreme Court, it remains a pivotal moment for U.S. trade policy and the balance of power in Washington.
