Trump is escalating European tensions. What are the consequences?

President Trump’s insistence that the U.S. acquire Greenland could become a major international crisis. He's now threatened tariffs on eight NATO allies who have expressed their opposition to the idea, and that is shaking up the World Economic Forum in Davos, Switzerland this week. And more tariffs would increase costs for American businesses at a time when American voters are talking about affordability at home. Willem Marx reports from Davos, and NPR’s Scott Horsley and Mara Liasson recap the economic and political fallout.