U.S. President Donald Trump signed orders Monday to impose new 50% tariffs on many Canadian goods, claiming “discriminatory treatment” by Ottawa against American alcohol, automobile and dairy products.

The tariffs take effect in 30 days and cover various items including wine, hockey sticks and cement, said the White House.

Trump, who saw many of his tariffs struck down by the Supreme Court this year, tapped an untested legal provision for the new duties — Section 338 of the Tariff Act of 1930.

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