It may appear that U.S. President Donald Trump's move to hit many Canadian products with a new tariff of 50 per cent came out of the blue, but there are clear signs of what's driving the tactic.

It may appear that U.S. President Donald Trump's move to hit many Canadian products with new tariffs of 50 per cent came out of the blue, but there are clear signs of what's driving the tactic. Mond…

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