President Donald Trump has been sending letters to countries outlining higher tariffs they’ll face if they don’t make trade deals with the U.S. by Aug. 1.

President Trump is alerting countries around the world of impending tariff rates that they will face when sending goods to the United States, hitting prominent trading partners and poorer nations

President Trump has told roughly two dozen countries that they will face tariffs of at least 20 percent on Aug. 1 if they don’t reach agreements by then.