The 18th-century constitutional clause that could cost Trump €150bn

The US Constitution has a clause requiring that all import duties be uniform across the country.

Earlier this week, a federal judge in New York invoked it — building on the Supreme Court ruling that found US President Donald Trump had no legal authority to impose tariffs under IEEPA — to make sure hundreds of thousands of importers get their money back.

In a three-page order, Judge Richard Eaton directed Customs and Border…