$SOL would impose a 50% tariff on imported copper and would soon deploy the long-promised tariffs on semiconductors and pharmaceuticals.

A day earlier, he began sending pricing letters, notifying 14 countries that significantly higher tariffs would take effect on August 1.

The tariff letters provided for a 25% tax on all products coming from Japan and South Korea, while some countries face tariffs of up to 40%.

Late Tuesday, Trump wrote on social media: "We will publish tomorrow morning a minimum of 7 countries affected by trade, with an additional number of countries published in the afternoon."

He provided no further details, while investors became cautious in anticipation of a new wave of tariffs.

The new tariffs have fueled fears of a global