In a landmark decision, the U.S. Supreme Court has dismantled a crucial element of President Donald Trump’s protectionist trade policies, ruling that he overstepped his authority by imposing extensive tariffs using emergency powers. The 6-3 ruling, announced on Friday, marks a significant setback for the Trump administration’s economic agenda, though it may only be a temporary halt as the President swiftly announced plans for new tariffs.
Court Decision Highlights Misuse of Emergency Powers
The Supreme Court’s ruling focuses on tariffs enacted under the International Emergency Economic Powers Act (IEEPA), which allows the President to regulate international commerce during a national emergency. This legislation was invoked by Trump to impose tariffs on various goods, including those from Canada, Mexico, and China, under the guise of national security and public health concerns related to fentanyl trafficking.
Chief Justice John Roberts articulated that the act does not explicitly grant the power to levy tariffs, stating, “Had Congress intended to convey the distinct and extraordinary power to impose tariffs, it would have done so expressly.” The Court upheld previous lower court decisions that determined Trump was acting beyond the powers granted by Congress, highlighting the necessity of adhering to a system of checks and balances.
Despite the ruling, the administration’s sector-specific tariffs on steel, aluminium, and automobiles, which have severely impacted Canadian trade, will remain unaffected. Trump responded to the decision with indignation, labelling the justices who voted against him as “a disgrace to our nation” and vowing to explore alternative legal avenues to impose tariffs.
Trump’s Immediate Plans for New Tariffs
In the wake of the Supreme Court’s decision, Trump announced plans to implement a new 10% global tariff through Section 122 of the Trade Act of 1974. This legislation permits the President to impose tariffs for a limited time without needing immediate Congressional approval, allowing him to maintain a degree of control over trade regulations.

The President’s approach has drawn criticism from various sectors, with business groups expressing concern over the potential for increased costs and supply chain disruptions. Neil Bradley, from the U.S. Chamber of Commerce, welcomed the Supreme Court’s ruling but cautioned against the continuation of tariff policies that could harm economic growth.
Implications for U.S.-Canada Trade Relations
While the Supreme Court’s decision is significant, its immediate effects on Canada may be limited. Canada was among the first countries to be impacted by IEEPA tariffs, with a 25% tariff on most goods that later escalated to 35%. However, a subsequent exemption for products complying with the United States-Mexico-Canada Agreement (USMCA) has allowed over 90% of Canadian exports to enter the U.S. tariff-free, despite ongoing challenges in specific sectors.
Avery Shenfeld, chief economist at the Canadian Imperial Bank of Commerce, noted that the ruling does not eliminate critical tariffs affecting Canadian industries but does alleviate the threat of a more severe 35% tariff if the U.S. withdraws from the USMCA. This ruling could strengthen Canada’s negotiating position in future trade discussions.
Broader Impact on Global Trade
The Supreme Court’s ruling may have wider ramifications for other trade partners, including the European Union, the UK, and Japan, who have negotiated deals with the U.S. under the pressure of potential IEEPA tariffs. While these countries may assess their agreements in light of the ruling, uncertainties remain about Trump’s next moves in trade policy.

The decision has been described as a “material rollback” of the administration’s tariff strategy, potentially reducing the effective U.S. tariff rate from approximately 13% to around 6%, which could translate to over $200 billion in reduced tariff collections.
Why it Matters
The Supreme Court’s ruling serves as a critical reminder of the limits of presidential power in trade policy, reinforcing the necessity of Congressional oversight. As businesses and countries navigate the aftermath, the uncertainty surrounding future tariffs poses challenges for international trade relations. The potential for new tariffs and ongoing adjustments to trade policies could reshape economic landscapes, impacting workers, consumers, and global markets alike.