Trump administration officials have reportedly held several secret meetings with far-right Canadian separatists who want to break free from the rest of the country.

U.S. officials met with leaders of the Alberta Prosperity Project, a fringe right-wing group of separatists who want the oil-rich western province to become independent, three times in Washington since last April, sources told the Financial Times.

News of the stealthy meetings comes at a time of especially high tensions between the U.S. and its northern neighbor. During a speech in Davos at the World Economic Forum, Canadian Prime Minister Mark Carney spoke of a “rupture” in the world order, in what appeared to be a veiled attack on the trade and foreign policies of Donald Trump – but without mentioning him by name.