President Donald Trump vowed to push forward with his aggressive tariff regime in the coming days, stressing he would not offer additional extensions on country-specific levies set to now hit in early August while indicating he could announce substantial new rates on imports of copper and pharmaceuticals.

U.S. President Donald Trump on Tuesday said he would impose a 50% tariff on imported copper and soon introduce long-threatened levies on semiconductors and pharmaceuticals, broadening his trade war that has rattled markets worldwide.

U.S. Commerce Secretary Howard Lutnick said Tuesday that another batch of tariff letters was close to going out, followed by “a general letter” that would cover trading partners that didn’t get their own missives.

President Donald Trump has sent letters to 14 countries outlining higher tariffs they’ll face if they don’t make trade deals with the U.S. by Aug. 1

The leaders of Japan and South Korea were the first to get letters on Monday that informed them of the new tariff rates.