FILE - In this April 13, 2017, file photo, Yemenis present documents in order to receive food rations provided by a local charity, in Sanaa, Yemen. 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. More than 20 million people are at risk of famine in nine African nations and Yemen, but Richard Stearns, president of Federal Way, Washington-based World Vision, says it has been overshadowed amid the controversies surrounding President Donald Trump's administration. (AP Photo/Hani Mohammed, File)
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