Amanpour: David Miliband, Christy Turlington Burns and Samantha Powers

David Miliband, the President and CEO of the International Rescue Committee, joins Christiane Amanpour to discuss Brexit, Yemen and Syria. Christy Turlington Burns, the model and Founder of Every Mother Counts talks about her recent return to the catwalk, her work addressing the issue of maternal mortality and her film "No Woman No Cry." Our Walter Isaacson talks to Samantha Powers, President Obama's Ambassador to the United Nations about her career and her new memoir "The Education of an Idealist."

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