Both countries will suffer from the trade war with steeper tariffs raising business costs and consumer prices.

Canadian Prime Minister Mark Carney vows to retaliate, says his country recognized that 'America has changed' and that the two countries would 'not return to our old relationship'

“Canada will match those tariffs dollar for dollar to protect our workers and businesses,” Prime Minister Mark Carney said in a statement.

Canada would match US tariffs "dollar for dollar", says Prime Minister Mark Carney.