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,

European leaders warned on Monday that U.S. President Donald Trump's threat to expand tariffs to the EU risked setting off a trade war that would cause economic harm on both sides of the Atlantic.

A top European Union official, who is trying to head off a potential trade conflict, stressed the importance of active engagement and fairness in trade during a four-hour meeting with Trump administra