“This shows the danger of having tariffs that are under the unilateral control of one man,” Setser said.

U.S. President Donald Trump announced on Wednesday a 50% tariff on copper, saying on social media that it would be effective August 1 and that the decision was made after a national security assessme...

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.