Without knowing the precise contents of their conversations, it is difficult to say with certainty why Karoline Leavitt, as White House spokesperson and on behalf of Donald Trump, brought up the option of using military force to take over Greenland.
However, given the timing, it seems to have been a defiant – and typically touchy – response to the polite but firm “joint statement” issued by the leaders of Denmark, France, Germany, Italy, Poland, Spain and the UK. They declared nothing less than the legal and moral truth that: “Greenland belongs to its people. It is for Denmark and Greenland, and them only, to decide on matters concerning Denmark and Greenland.”