Trump imposed a 10% duty on Canadian energy imports and a 25% tariff on Mexican products, prompting retaliation from both countries. The tariffs, aimed at addressing a national emergency, threaten a trade war that could hinder global growth and raise consumer prices.

New trade penalties against Canada, Mexico and China that President Donald Trump plans to impose represent an aggressive early move against America’s three largest trading partners, but at the risk of higher inflation and possible disruptions to the global economy.

President Donald Trump has said he will stick to his pledge to impose aggressive new tariffs on Canada, Mexico and China today. Follow for live updates.

Mr Trump’s announcement of the new duties ought to erase any doubts about his resolve to take a hard line on trade, heedless of warnings from businesses, diplomats and economists about the potential fallout.

President Donald Trump's threatened tariffs against Mexico, Canada and China went into effect Saturday evening, slapping a 25% wholesale tariff on both Mexico and Canada at once.