On Friday, after the Supreme Court struck down most of Trump's tariff agenda, he announced that he would quickly implement a 10% flat tariff for all trading partners using a different trade law. One day later, Trump posted on Truth Social that "effective immediately" he would be "raising the 10% Worldwide Tariff ... to the fully allowed, and legally tested, 15% level." Under the trade law the administration is now turning to, called Section 122, tariffs of up to 15% can be quickly applied, but only for up to 150 days.