President Trump on Monday said the U.S will impose 25% tariffs on goods from South Korea and Japan by Aug. 1, while also threatening to hit a dozen other nations with steep import duties by next month.

President Donald Trump sent letters to 14 countries Monday outlining higher tariffs they’ll face if they don’t make trade deals with the U.S. by Aug. 1. In the letters, which were posted on Truth Social, Trump warned countries that they would face even higher tariffs if they retaliated by increasing their own import taxes.