US stock futures waver after the S&P 500 posted its biggest drop in three months. President Trump brushes off concerns that his Greenland threats will spoil trade deal with the EU ahead of his address in Davos. Shares of Netflix fall after a tepid outlook citing higher program spending and the potential cost for its Warner Bros. Discovery bid. Salesforce CEO Marc Benioff and US Special Envoy Steve Witkoff join Bloomberg Brief from the World Economic Forum in Davos.