President Donald Trump has warned that a Supreme Court ruling against his administration's tariffs would create a "complete mess" and potentially cost trillions of dollars. He stated on social media that the U.S. would be "screwed" if forced to refund hundreds of billions in collected tariffs, plus additional claims from companies and countries that invested to avoid duties. Trump emphasized the complexity and potential impossibility of calculating and repaying such sums, which he argued could take years.