Supreme Court Deals Major Blow to Trump’s Global Tariff Strategy in Unexpected Ruling

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The US Supreme Court has dealt a major blow to former President Donald Trump’s trade agenda, striking down a large part of his global tariff programme and ruling that he went beyond the powers granted to him under the Constitution.

The decision, handed down on 20 February 2026, centres on how far a US president can go when using emergency powers to reshape the economy. At issue was the International Emergency Economic Powers Act (IEEPA), a law passed decades ago that Trump’s administration relied on to justify imposing tariffs on imports from hundreds of countries. The White House argued that long-standing trade imbalances amounted to a national emergency, giving the president the authority to act without Congress.

The Supreme Court disagreed. In a 6–3 ruling, the justices said the law does not give the president the power to impose broad import taxes. Tariffs, the court made clear, fall under Congress’s authority not the executive branch, no matter how urgent the situation is framed.

Writing for the majority, Chief Justice John Roberts acknowledged that presidents do have room to regulate trade during genuine national emergencies. But he drew a clear line, saying those powers stop short of creating sweeping tariff regimes without explicit approval from lawmakers. Congress, Roberts wrote, controls taxation and trade policy, a core principle that underpins the balance of power in the US system of government.

For global markets and trading partners, the decision brings a measure of clarity after months of uncertainty. Trump’s tariff regime, announced in early 2025 on what his administration labeled “Liberation Day,” had slapped a baseline tariff of 10 % on most imports and significantly higher levies on imports from key partners such as China, Canada and Mexico. Those measures were intended to reduce the US trade deficit and protect domestic manufacturing but had also provoked widespread criticism from business groups and foreign governments.

In his reaction, Trump denounced the justices who ruled against him, including some he had appointed, accusing them of failing to stand up for American economic interests in unusually personal terms. Legal analysts noted that such public criticism of the Court was rare and underscored the depth of frustration in Trump’s approach to executive power.

While the decision affects many of the tariffs imposed under the IEEPA, it does not immediately strip the United States of all trade tools. Trump’s team and congressional allies have indicated they will explore alternative statutory authorities that do explicitly grant tariff powers such as provisions tied to national security or trade retaliation to reintroduce tariffs through more traditional channels.

Economists say the Supreme Court’s decision underscores the constitutional limits of presidential power, especially in areas with wide-ranging economic impact. Nearly $133 billion in tariffs collected under the IEEPA mechanism may now be subject to legal challenges or possible refunds to importers, creating significant uncertainty for US businesses and consumers alike.

For Washington and its global counterparts, the ruling represents both a rebuke to unilateral executive action and a reminder that trade one of the most complex and impactful areas of policy, remains squarely in the hands of elected lawmakers.