US President Barack Obama (R) is talking to German Chancellor Angela Merkel (L) during a meeting at the G20 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 / Johannes EISELEJOHANNES EISELE/AFP/Getty Images

US President Barack Obama arrives for a meeting at the G20 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 / Johannes EISELEJOHANNES EISELE/AFP/Getty Images

US President Barack Obama arrives at the Hangzhou 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

China's President Xi Jinping (C) and G20 leaders pose for family photo 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 AND AFP PHOTO / STEPHEN CROWLEYSTEPHEN CROWLEY/AFP/Getty Images

China's President Xi Jinping (C) and G20 leaders pose for family photo 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 AND AFP PHOTO / STEPHEN CROWLEYSTEPHEN CROWLEY/AFP/Getty Images

US President Barack Obama (R) arrives at the Hangzhou 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

Indian Christians gather as they pay obeisance to a statue of Mother Teresa unveiled at a church in Chennai on September 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 are 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. / AFP PHOTO / ARUN SANKARARUN SANKAR/AFP/Getty Images

Indian Christians pay obeisance to a statue of Mother Teresa unveiled at a church in Chennai on September 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 are 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. / AFP PHOTO / ARUN SANKARARUN SANKAR/AFP/Getty Images