Tariffs on an array of Canadian products took effect over the weekend with Trump threatening further measures on cars and trucks Sign up for the US Breaking News email Trump announces new 50% tariff on Canadian cars, trucks and steel Canada 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 … in Quebec , these are rights,” days after receiving widespread praise from political leaders for rejecting a US trade proposal that many perceived as weakening the country’s Francophone culture. Darline Graham and Ralph Norman face South Carolina voters yet again in a special Republican primary ru