British Prime Minister David Cameron signs the group photo of the G-20 leaders, taken the previous day at the G-20 summit in Antalya on November 16, 2015. AFP PHOTO / POOL (Photo credit should read STR/AFP/Getty Images)
British Prime Minister David Cameron signs the group photo of the G-20 leaders, taken the previous day at the G-20 summit in Antalya on November 16, 2015. AFP PHOTO / POOL (Photo credit should read STR/AFP/Getty Images)