FILE - In this Sept. 12, 2016, file photo, actors George Clooney, right, and Don Cheadle, left, arrive for a news conference to discuss an investigation about corruption in South Sudan at the National Press Club in Washington. Eight of the largest U.S.-based aid groups are joining together in a new campaign to address what the United Nations calls the world's largest humanitarian crisis in more than 70 years. The Global Emergency Response Coalition counts Twitter and Google among its sponsors. Clooney narrated a video pitch for the campaign. (AP Photo/Pablo Martinez Monsivais, File)
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