US President Donald Trump announced he would scrap all trade negotiations with Canada.
Trump was angered by a television advertisement sponsored by Ontario that used the words of former President Ronald Reagan to criticise his tariff policy.
The move has prompted the Ontario provincial government to announce that the ad would be taken down.
The ad in question featured a 1987 speech by former Republican President Ronald Reagan criticising tariffs on foreign goods, which he said would inevitably cause job losses and trade wars.
Reagan said in the video: "When someone says, 'let's impose tariffs on foreign imports,' it looks like they are doing the patriotic thing by protecting American products and jobs. But over the long run, such trade barriers hurt every American worker and consumer."
It is reported that the ad cost the Ontario government about 750 million Canadian dollars.
Reagan signed the free trade agreement with Canada in the 80s.
Trump, in a Truth Social post, said he decided to terminate trade talks with US's northern neighbour after learning of the anti-tariff ad, attacking it as being "fake."
Ontario decided to pull the ads over Trump's objections, but will allow them to be shown this weekend, including in games one and two of the World Series.
The Ronald Reagan Presidential Foundation & Institute said the ad had misrepresented the words of the former president through editing.
The Canadian prime minister has indicated that he's ready to resume talks with Washington on trade.
He also made it clear that his government would seek to explore more opportunities through developing relations with Asian nations.
Carney said: "We stand ready to pick up on that progress and build on that progress when the Americans are ready to have those discussions."