On July 7, his administration pushed back some of its most punishing duties by another three weeks to August, following a 90-day delay. A day later, Trump said the U.S. will impose 50% tariffs on copper, as well as 200% tariffs on pharmaceuticals.

President Trump said the U.S. will impose steep levies on imports from 20 countries starting next month, raising pressure on trading partners.

It shows that personal grudges rather than simple economics are a driving force in the U.S. leader’s use of tariffs.