U.S. President Donald Trump withdrew the invitation to Canada to join his “Board of Peace,” days after Prime Minister Mark Carney’s address in Davos warning against economic coersion by the world’s superpowers.

“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,” Trump said in a post on Truth Social on Thursday night stateside.

Carney said last week that he intended to join the board but details, including financial terms, had yet to be worked out. States looking for a permanent seat need to pay $1 billion.

In his speech at the World Economic Forum in Davos, Switzerland, earlier this week, Carney said the world’s “middle powers” must band together to resist coercion from the world’s largest powers.

“Great powers have begun using economic integration as weapons. Tariffs as leverage, financial infrastructure as coercion, supply chains as vulnerabilities to be exploited,” he said.