United Nations Secretary General Ban Ki-moon speaks during a side event entitled: "Mayor’s Focus Session: Cities’ Response to Migration" at the the World Humanitarian Summit in Istanbul, Tuesday, May 24, 2016. World leaders and representatives of humanitarian organisations from across the globe gathered in Istanbul on May 23-24, 2016 for the first World Humanitarian Summit, focused on how to reform a system many judge broken. (Isa Terli/Pool Photo via AP)
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