ANTALYA, TURKEY - NOVEMBER 16:  U.S President Barack Obama speaks to the media during his closing press conference on day two of the G20 Turkey Leaders Summit on November 16, 2015 in Antalya, Turkey. World leaders will use the summit to discuss issues including, climate change, the global economy, the refugee crisis and terrorism. The two day summit takes place in the wake of the massive terrorist attack in Paris which killed more than 120 people.  (Photo by Chris McGrath/Getty Images)