In a huge blow to the executive branch’s authority over global commerce, the Supreme Court handed down a 6–3 decision today declaring President Trump’s sweeping use of emergency powers to enact tariffs fundamentally illegal. The ruling immediately imperils the cornerstone of the administration’s economic strategy, transforming America’s negotiator-in-chief into a leader stripped of his most potent leverage.
This is because the majority of Trump’s tariffs were deployed under the International Emergency Economic Powers Act (IEEPA), which the administration used to justify a vast network of reciprocal tariffs applied to most trading partners under the pretext of a “balance of payments emergency.” Additionally, it levied distinct, targeted tariffs against Canada, China, and Mexico, citing a “drug trafficking emergency.” The Supreme Court’s decisive ruling concluded that utilizing the IEEPA for these purposes was unlawful.
