Donald Trump’s tariffs are a headache for all his trade partners. But the U.S. president’s plan to impose ad hoc “reciprocal” levies on imports are a particular problem for the European Union. By enabling him to target whichever countries in the bloc he pleases,

Trump and his cabinet hold divergent views on the use and purpose of tariffs. The EU needs a robust defence of its interests on all fronts

European leaders said they would respond firmly to higher levies on steel and aluminum, but they had yet to say what that retaliation would look like.