Former British Prime Minister Tony Blair speaks as Reuters Editor-at-Large Sir Harold Evans (not pictured) moderates a Reuters Newsmaker conversation "Politics on the Edge," in Manhattan, New York, U.S., September 20, 2016. REUTERS/Bria Webb

Former British Prime Minister Tony Blair speaks as Reuters Editor-at-Large Sir Harold Evans (not pictured) moderates a Reuters Newsmaker conversation "Politics on the Edge," in Manhattan, New York, U.S., September 20, 2016. REUTERS/Bria Webb

Former British Prime Minister Tony Blair smiles as Reuters Editor-at-Large Sir Harold Evans (not pictured) moderates a Reuters Newsmaker conversation "Politics on the Edge," in Manhattan, New York, U.S., September 20, 2016. REUTERS/Bria Webb

EpiPen auto-injection epinephrine pens manufactured by Mylan NV pharmaceutical company for use by severe allergy sufferers are seen in Washington, U.S. August 24, 2016. REUTERS/Jim Bourg/File Photo

U.S. President Barack Obama addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 20, 2016. REUTERS/Carlo Allegri

Pope Francis arrives during the inter-religious meeting "Prayer for Peace" in Assisi, Italy, September 20, 2016. Osservatore Romano/Handout via Reuters

Pope Francis arrives during the inter-religious meeting "Prayer for Peace" in Assisi, Italy, September 20, 2016. Osservatore Romano/Handout via Reuters

Pope Francis (L) hugs Ecumenical Patriarch Bartholomew I (R) during the inter-religious meeting "Prayer for Peace" in Assisi, Italy, September 20, 2016. Osservatore Romano/Handout via Reuters