WASHINGTON — President Donald Trump said that his new Board of Peace was withdrawing Canada’s invitation to join, days after Prime Minister Mark Carney issued a withering speech at the World Economic Forum in Davos warning against coercive tactics by the world’s great powers.

“Dear Prime Minister Carney: Please let this Letter serve to represent that the Board of Peace is withdrawing its invitation to you regarding Canada’s joining, what will be, the most prestigious Board of Leaders ever assembled, at any time. Thank you for your attention to this matter!” Trump wrote in a social media post published as he flew back to the U.S. from Switzerland.

The missive was a sharp reversal from last week, when Carney accepted an offer from Trump to join the board.

At the time, he had just concluded a high-profile visit to China, where he met with President Xi Jinping and struck a deal to lower trade barriers between their two nations.

The agreement was part of Canada’s east-west trade strategy to diversify trade lines in the face of what has been a year of north-south supply chain unrest between Canada and the U.S. — driven largely by Trump’s own tariff and trade declarations.

Earlier this week, however, Carney made headlines for a speech at the World Economic Forum in which he warned so-called middle powers to band together to resist intimidation by the world’s great powers. Although the speech didn’t mention Trump by name, Carney took aim at several of his foreign policies, such a using “tariffs as leverage, financial infrastructure as coercion, supply chains as vulnerabilities to be exploited.”

“Stop invoking the ‘rules-based international order’ as though it still functions as advertised,” Carney said in Davos. “Call the system what it is: a period where the most powerful pursue their interests using economic integration as a weapon of coercion.”

Trump rebuked Carney directly in his own Davos speech, telling the prime minister that he should be more grateful for U.S. contributions to Canada’s defense.

“Canada lives because of the United States,” Trump said Wednesday. “Remember that, Mark, the next time you make your statements.”

Carney’s office didn’t immediately respond to a request for comment on Thursday night.

Earlier Thursday, after his return to Canada, Carney continued his argument that his country must step up at a critical moment.

“In a time of rising populism and ethnic nationalism, Canada can show how diversity can be a strength, not a weakness,” the prime minister said in a speech on Thursday, before a meeting with his cabinet in Quebec City.

(Laura Dhillon Kane contributed to this report.)

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