‘That’s their problem’: Trump threatens Greenland's leader after vow to stay with Denmark

President Donald Trump threatened yet another foreign leader on Tuesday during a press gaggle at Joint Base Andrews after returning to Washington, D.C. from a brief trip to Detroit.

Earlier in the day, Greenland Prime Minister Jens-Frederik Nielsen said his country would rather stay as part of Denmark than become part of the U.S. Nielsen's comments come at a time when Trump has upped the ante against Greenland, saying the U.S. needs to control the island nation for its own national security.