IMF Managing Director Christine Lagarde (L), British Prime Minister Theresa May (C) and President of the European Commission Jean-Claude Juncker (R) arrive for the opening ceremony of the G-20 Summit in Hangzhou on September 4, 2016. G20 leaders confront a sluggish global economy and the winds of populism as they open annual talks, but the long war in Syria and the South China Sea territorial dispute hang over the summit. / AFP PHOTO / POOL / Mark SchiefelbeinMARK SCHIEFELBEIN/AFP/Getty Images