After President-elect Trump fired off a series of social media posts on Christmas Day suggesting the United States should expand into Canada and Greenland and take control of the Panama Canal, some officials in those regions are firing back.

At first, he joked about Canada being an additional US state. Since, he has threatened to take back control of the Panama Canal. He also reiterated a desire from his first term to own the autonomous Danish territory of Greenland, which is not for sale.

In recent days the president-elect has called for asserting U.S. control over the Panama Canal and Greenland, showing that his “America First” philosophy has an expansionist dimension.