President Donald Trump has warned that any country seeking to “play games” with the United States over trade following a Supreme Court ruling on tariffs will face sharply higher duties and “worse” consequences than under existing deals. His comments come after the court found that tariffs imposed last year under a national emergency law were unlawful, throwing a cloud of uncertainty over a string of recent U.S. trade agreements.
In a characteristically combative post on his Truth Social platform, Trump railed against what he called a “ridiculous” Supreme Court decision and singled out nations he says have “ripped off” the U.S. for years or even decades. He warned that any government tempted to use the ruling as a pretext to walk away from commitments made in response to his tariff measures would be met with significantly higher import taxes than those they had just agreed. “BUYER BEWARE!!!” he wrote, in a message clearly aimed at trade partners considering whether to revisit recent deals.
The Supreme Court ruling held that Trump overstepped his authority when he used a national emergency statute to levy broad duties on imports from nearly all major U.S. trading partners. The decision has rekindled concern in capitals from Brussels to New Delhi about the stability and enforceability of agreements tied to those now-invalidated tariffs. Some governments have already moved to pause or review their arrangements with Washington, with European Union officials and Asian partners signalling they are reassessing their next steps.
Trump and his advisers have responded by exploring alternative legal tools to maintain pressure on trading partners and keep tariffs in place. He has floated the idea of a new across-the-board import tax at a lower baseline rate, while insisting that other, court-approved tariff authorities remain available and could be used “in a much more powerful and obnoxious way”. Business groups and foreign officials, however, warn that shifting legal justifications and headline rates risk deepening what one senior European lawmaker described as “pure tariff chaos.”
For now, Trump’s warning appears designed to deter governments from treating the court ruling as an invitation to unravel fragile compromises forged over months of tense negotiations. But it also underscores the broader uncertainty hanging over U.S. trade policy, as allies and rivals alike weigh the prospect of fresh legal battles, new tariff rounds and the possibility of retaliatory measures in the months ahead.
