Trump Renews Greenland Push; Denmark Invokes NATO Defense Clause

Trump renews his demand that the United States take control of Greenland, saying the US 'absolutely' needs it. Danish Prime Minister Frederiksen warns: 'If the United States chooses to attack another NATO country militarily, then everything stops — that is, including our NATO.' The crisis marks the first time a NATO ally formally invokes the specter of the US attacking a fellow member.