Why Trump can’t let Greenland go

Last year, President Trump reportedly floated the idea of buying Greenland from Denmark, even after he was told it was not for sale. This summer on a trip to Denmark, Secretary of State Mike Pompeo was asked again about the President's interest in buying Greenland -- and Pompeo did not shut it down. Chris Cillizza explains what exactly is going on with Trump and Greenland, and why this idea just won't go away.