The challenge to Trump’s tariffs marks a major test of presidential powers and of the court’s willingness to check some of the Republican president’s sweeping declarations of authority since he returned to power in January 2025. The outcome will also have consequences for the global economy. During oral arguments in the case the court heard on Nov. 5, conservative and liberal justices appeared to cast doubt on the legality of the tariffs, which Trump imposed by invoking a 1977 law intended for use during national emergencies. Trump’s administration is appealing lower court rulings that he overstepped his authority.
Trump has said tariffs have made the United States financially stronger. In a social media post on January 2, Trump said a Supreme Court ruling against the tariffs would be a “terrible blow” to the United States. Trump invoked the International Emergency Economic Powers Act to impose so-called “reciprocal” tariffs on goods imported from individual countries (nearly any foreign trading partner) to address what he called a national emergency over U.S. trade deficits. He invoked the same law to impose tariffs on China, Canada and Mexico, calling the trade of the commonly abused painkiller fentanyl and illegal drugs into the United States a national emergency.
The challenges to the tariffs in the Supreme Court cases were brought by companies affected by the tariffs and by 12 U.S. states, most of which are Democratically governed.
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