World leaders, rattled by Donald Trump's latest gambit in Greenland, look to present a united front at the World Economic Forum. As world leaders, including allies of the United States, gather in the Swiss resort city of Davos for the World Economic Forum (WEF), US President Donald Trump's attacks on the existing global world order have been on the top of their minds with Canadian Prime Minister Mark Carney saying the US-led global system is enduring a rupture.