U.S. President Barack Obama (L) watches as Chinese President Xi Jinping (R) speaks during the opening ceremony of the G20 Summit at the International Expo Center 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

Turkish President Recep Tayyip Erdogan arrives for the G20 Summit at the International Expo Center 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 / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

US Secretary of State John Kerry speaks at a press conference in Hangzhou during the G20 Leaders Summit 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 / WANG ZHAOWANG ZHAO/AFP/Getty Images

US Secretary of State John Kerry speaks at a press conference in Hangzhou during the G20 Leaders Summit 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 / WANG ZHAOWANG ZHAO/AFP/Getty Images

Turkish President Recep Tayyip Erdogan arrives for the G20 Summit at the International Expo Center 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 / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images

An Indian christian prays at Sacred Heart Cathedral church in New Delhi on August 4, 2016,ahead of the canonisation of Mother Teresa in Rome. Indian Christians are eagerly looking forward to the canonisation of Mother Teresa and churches across the country would be holding special masses in her honour. As the Vatican prepares to declare Mother Teresa a saint on September 4, in the Indian city where she rose to fame, claims of medical negligence and financial mismanagement at her care homes threaten to cloud her legacy. Singing nuns and followers clutching flowers flocked to Mother Teresa's tomb in the Indian city of Kolkata to celebrate her proclamation as a saint at the Vatican. People started gathering from early morning at Mother House in Kolkata for a special mass for the "Saint of the Gutters" ahead of the ceremony due at St Peter's Basilica. / AFP PHOTO / SAJJAD HUSSAINSAJJAD HUSSAIN/AFP/Getty Images

Japanese Prime Minister Shinzo Abe attends the opening ceremony of the G20 Summit at the International Expo Center 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

Turkey's President Recep Tayyip Erdogan (R) arrives at the G20 Summit at the International Expo Center 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 / Rolex DELA PENAROLEX DELA PENA/AFP/Getty Images