The Supreme Court announced Friday that a broad slate of Donald Trump’s tariffs is illegal, delivering a historic blow to the administration’s economic strategy and redefining the limits of presidential trade power.
In a rare move, the justices rejected the legal foundation Trump used to impose many of the levies. The ruling makes clear that the White House cannot stretch emergency authority to rewrite tariff policy without Congress.
Trump placed more than half of the current tariffs under the International Emergency Economic Powers Act, a law traditionally used to address national security threats. He argued the statute allowed him to act quickly and independently. However, during an expedited hearing in November, several justices, including conservatives, openly questioned whether the law granted such sweeping authority.
The court’s opinion directly addressed that argument.
“Against that backdrop of clear and limited delegations, the Government reads IEEPA to give the President power to unilaterally impose unbounded tariffs and change them at will. That view would represent a transformative expansion of the President’s authority over tariff policy,” the ruling says.
The consequences could stretch far beyond the courtroom. Businesses that paid the now-invalid tariffs may seek refunds, a process that could involve billions of dollars and create logistical challenges for federal agencies. In addition, other countries may reassess trade agreements negotiated earlier this year that were built around those tariffs.
Even so, the tariffs may not vanish overnight. The Trump administration has previously indicated it would explore alternative trade authorities if the court struck the measures down, signaling that the broader policy fight is far from over.
