Canada’s announcement comes despite a detente having been reached Tuesday over the threat of a 25% surcharge on U.S. electricity consumers.

Canada is the largest foreign supplier of steel and aluminum to the U.S.

The federal government is expected to announce later this hour a plan to slap tariffs on $29.8 billion worth of American goods to hit back against U.S. President Donald Trump after he imposed punishing tariffs on Canadian steel and aluminum early this morning,