I think that would be up to Denmark, as they are the owner of Greenland. And I don't think they have any interest in selling it. I know that probably means nothing to you and your ilk however. Go ahead, try to take it from them. It'll be yet another riveting page in the great MAGA legacy, which future generations of schoolkids will learn about in history class as "the dark days of America."Could trump legally buy Greenland through ex. order or would he have to have congressional approval. I would think congressional approval.