A Central American migrant is stopped by U.S. agents who order him to go back to the Mexican side of the border, after a group of migrants got past Mexican police at the Chaparral crossing in Tijuana, Mexico, Sunday, November 25, 2018, at the border with San Ysidro, California. The mayor of Tijuana has declared a humanitarian crisis in his border city and says that he has asked the United Nations for aid to deal with the approximately 5,000 Central American migrants who have arrived in the city. (Photo by Pedro Acosta/AP Photo)
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