U.S. President Trump announced via Truth Social his intention to increase a previously declared worldwide tariff from 10 to 15 percent, following a review of a Supreme Court ruling that deemed some of his prior tariffs unlawful due to their reliance on an emergency law. The Supreme Court had rejected Trump's argument that these tariffs were essential for economic security. Trump characterized the court's decision as "exceptionally anti-American" and asserted the new 15 percent tariff is "fully permissible and legally vetted," citing the Trade Act of 1974 as the basis for these temporary import duties, which can last up to 150 days without congressional approval. The implementation of this immediate increase remains unclear, and international reactions, including from the EU, indicate a period of assessment and uncertainty.