ABOARD AIR FORCE ONE (AP) — President Donald Trump is heading to the World Economic Forum in the Swiss Alps where his ambitions to wrest control of Greenland from NATO ally Denmark could tear relations with European allies. Trump arrives Wednesday at the international forum at Davos on the heels of threatening tariffs on Denmark and seven other allies unless they negotiate a transfer of the semi-autonomous territory — a concession the European leaders indicated they are not willing to make. Trump said the tariffs would start at 10% next month and climb to 25% in June, rates high enough to increase costs and slow growth, potentially hurting Trump’s efforts to tamp down the high cost of living.