Analysis: Who can save NATO from Trump as he escalates bid to grab Greenland?

President Donald Trump has pitched NATO into what could become its worst-ever crisis by threatening new tariffs against US allies who oppose his grab for Greenland against the will of its people.

​ President Donald Trump has pitched NATO into what could become its worst-ever crisis by threatening new tariffs against US allies who oppose his grab for Greenland against the will of its people. Read More Breaking News, Latest News and Videos | CNN