President Donald Trump on Monday warned other nations against "playing games" on trade in the wake of a Supreme Court ruling that struck down some of his tariffs.

"Any Country that wants to “play games” with the ridiculous supreme court decision, especially those that have 'Ripped Off' the U.S.A. for years, and even decades, will be met with a much higher Tariff, and worse, than that which they just recently agreed to," he posted on Truth Social. "BUYER BEWARE!!! Thank you for your attention to this matter."

Trump's warnings came in the wake of a Friday Supreme Court ruling which found that the president did not have the authority to impose tariffs under the International Emergency Economic Powers Act (IEEPA). Trump has since imposed a 15% global tariff using a different statutory authority.

Since announcing his Liberation Day tariffs in 2025, Trump has concluded trade deals with the UK, EU, Japan, South Korea, the Philippines, Vietnam, Indonesia, India, Malaysia, and a number of other key trading partners.

He has yet to formalize agreements with Mexico, Canada, and China, however.

Ben Whedon is the Chief Political Correspondent at Just the News. Follow him on X.