Tariffs on an array of Canadian products took effect over the weekend with Trump threatening further measures on cars and trucksSign up for the US Breaking News emailTrump announces new 50% tariff on Canadian cars, trucks and steelCanada said it will announce its response to Donald Trump’s new tariffs, as the neighbours that used to be close allies spiral into a trade war.Canadian PM Mark Carney said on Monday that while American negotiators saw the French language in Canada as an “irritant