U.S. will impose 50% tariffs on $20 billion worth of Canadian goods, and Canada set Sept. 8 as the start of its retaliatory penalties.

The United States imposed 50% tariffs on $20 billion worth of Canadian products early Saturday, and Canada immediately said it would retaliate, after last-ditch negotiations…

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'