President Donald Trump signed an order Monday imposing global tariffs of 25% on all steel and aluminum imports in a move that will likely please domestic steelmakers but hurt allies like Canada and Mexico.

The president, who has threatened and delayed other tariffs, said he will announce the new measures Monday. Canada and Mexico are among the U.S.’s top steel suppliers.

President Donald Trump said he will announce on Monday that the United States will impose 25% tariffs on all steel and aluminum imports, including from Canada and Mexico, as well as other import duties later in the week.