The European Union’s executive branch has vowed to “take firm and immediate action” against U.S. President Donald Trump’s imposition of tariffs on steel and aluminum.

European Commission President Ursula von der Leyen said the bloc will respond if Donald Trump follows through on his threat to impose global reciprocal tariffs, calling them a “step in the wrong direction.

The commission’s response comes after Trump instructed staff to create tariffs on countries he sees as having unfair trade policies with the U.S.