US President Donald Trump has imposed a 50% tariff on a wide range of goods imported from Canada, in retaliation for what he called "unequal treatment" of US cars, dairy and alcohol. On Tuesday, he said the tariffs are a response to how Canada has treated US farmers. The White House said the duties would take effect in 30 days. It marks a major escalation in trade tensions between the North American neighbours.

Read more about the tariffs here.