Migrants stand near Mexican police at the Mexico-U.S. border in Tijuana, Mexico, Sunday, Nov. 25, 2018, as they try to reach the U.S. 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. (AP Photo/Rodrigo Abd)

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