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Canadian Prime Minister Justin Trudeau (L) and British Prime Minister David Cameron (R) attend a working session on the Global Economy during the G20 summit in Antalya, on November 15, 2015. Leaders from the world's top 20 industrial powers meet in Turkey from November 15 seeking to overcome differences on a range of issues including the Syria conflict, the refugee crisis and climate change. AFP PHOTO/OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)

Canadian Prime Minister Justin Trudeau (L) and British Prime Minister David Cameron (R) attend a working session on the Global Economy during the G20 summit in Antalya, on November 15, 2015. Leaders from the world's top 20 industrial powers meet in Turkey from November 15 seeking to overcome differences on a range of issues including the Syria conflict, the refugee crisis and climate change. AFP PHOTO/OZAN KOSE        (Photo credit should read OZAN KOSE/AFP/Getty Images)