The US is banning Canadian products, including alcohol, dairy, and motor vehicles, as Canadian retaliatory tariffs on American goods come into force.
In a series of executive orders on Tuesday, US President Donald Trump wrote that “Canada is discriminating in fact against the commerce of the United States,” and ordered the import ban, which will begin 29 September.
Earlier on Tuesday, Canada Prime Minister Mark Carney said in a video address that his country’s pivot away from the US as its largest trading partner “will come at a cost”.
Both US and Canadian officials have said they would like to strike a deal, but no new talks have been scheduled since negotiations collapsed in late August.
Last month, the White House had imposed 50% tariffs on around $20bn (£14.8bn) of Canadian goods after several rounds of talks had broken down.
Canada responded with dollar-for-dollar retaliatory tariffs on US goods like steel, clothing and furniture. The counter-duties came into effect after midnight on Tuesday.
Tension between the US and Canada has also expanded beyond tariffs.
In August, Trump ordered Lake Ontario to be renamed as Lake America, resulting in uproar from Canadians and some Americans.
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