(Rodrigo Abd | AP Photo) Early morning light illuminates the face of a migrant woman and her child as she wakes after sleeping under a bridge at the Chaparral border crossing in Tijuana, Mexico, Friday, Nov. 23, 2018. 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.