The Dip: Will Trump's Greenland obsession result in a tariff meltdown?

US President Trump arrived in Davos with apparently one thing on his mind: Greenland. He says it's vital for US national interests and was apparently willing to use his favorite tool (tariffs) to get what he wanted. But a surprising U-Turn means there might be a deal on the table. For now, at least. The Dip speaks to Brown University's Mark Blyth to break it down.