If the United States imposes tariffs on imports of Canadian steel and aluminum, some Americans will lose their jobs and U.S. growth will suffer, Prime Minister Justin Trudeau said on Wednesday.

President Donald Trump on Monday imposed a 25% tariff on all steel and aluminum imports into the United States with no exceptions or exemptions.

Mr. Trump’s decision to impose tariffs on metals is not new. In his first term, the president levied tariffs on foreign steel and aluminum globally, angering allies like Mexico, Canada and the European Union. He ultimately rolled back some of those barriers on Canada and Mexico when they signed a revised trade agreement with the United States.