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.

President Donald Trump on July 7 threatened to impose 25 percent tariffs on Japan and South Korea, and levies as high as 40 percent on 12 other countries, if they did not reach a deal by August 1.