The European Union estimates that the first wave of Donald Trump’s steel and aluminum tariffs will hit as much as €28 billion ($29.3 billion) of the bloc’s exports in what would be a massive escalation in the US president’s trade war.

President Donald Trump confirmed Monday that his new 25% tariffs on all Canadian and Mexican goods will “go forward” on March 4. The president ordered the new tariffs in early February but delayed their implementation for one month after the Canadian and Mexican governments brokered agreements with the White House regarding border security and fentanyl

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,