Thousands of migrants are living in crowded tent cities in Tijuana after undertaking a grueling journey from Central America to the U.S. border. A steady trickle of migrants have been finding ways to climb over, tunnel under or slip through the U.S. border wall to plant their feet on U.S. soil and ask for asylum. (AP Photo feature)
Yesenia Martinez, 24, reaches back from the San Diego, California side of the U.S. border wall to get her baby's bottle, after crossing underneath from Tijuana, Mexico, Friday, Dec. 7, 2018. Martinez is among a wave of Central Americans getting past the imposing barrier between Mexico and California and expediting their asylum claims by readily handing themselves over to U.S. agents. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
Honduran migrant Joel Mendez, 22, passes his eight-month-old son Daniel through a hole under the U.S. border wall to his partner, Yesenia Martinez, 24, who had already crossed in Tijuana, Mexico, Friday, Dec. 7, 2018. Moments later Martinez surrendered to waiting border guards while Mendez stayed behind in Tijuana to work, saying he feared he'd be deported if he crossed. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
Honduran migrant Joel Mendez, 22, feeds his eight-month-old son Daniel as his partner Yesenia Martinez, 24, crawls through a hole under the U.S. border wall, in Tijuana, Mexico, Friday, Dec. 7, 2018. Moments later Martinez surrendered to waiting border guards while Mendez stayed behind in Tijuana to work, saying he feared he'd be deported if he crossed. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
Honduran migrant Leivi Ortega, 22, wearing a rosary, looks at her phone while she, her partner and their young daughter, wait in hopes of finding an opportunity to cross the U.S. border from Playas de Tijuana, Mexico, Wednesday, Dec. 5, 2018. In early December, U.S. Customs and Border Protection said that the San Diego sector experienced a "slight uptick" in families entering the U.S. illegally with the goal of seeking asylum. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
A Central American migrant lowers herself down from atop the border wall onto the U.S. side, after crossing in Playas of Tijuana, Mexico, late Monday, Dec. 3, 2018. By word of mouth, some migrants have realized they can simply cross into U.S. territory, largely uninhibited by Mexican authorities, and turn themselves into U.S. border patrol agents as a way to apply for asylum. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
A Honduran migrant walks with his son in his arms after jumping the U.S. border wall with plans to turn himself over to U.S. border patrol agents in order to apply for asylum, seen from Tijuana, Mexico, Thursday, Nov. 29, 2018. In twos or threes, or sometimes by the dozen, migrants arrive at the U.S. border wall and manage to cross over. (AP Photo/Ramon Espinosa)
By: Ramon Espinosa
A Honduran migrant helps a young girl cross to the American side of the border wall, in Tijuana, Mexico, Sunday, Dec. 2, 2018. In November, President Donald Trump issued a proclamation suspending asylum rights for people who try to cross into the U.S. illegally from Mexico, although a divided U.S. appeals court has refused to immediately allow the Trump administration to enforce the ban. (AP Photo/Ramon Espinosa)
By: Ramon Espinosa
A woman climbs the U.S. border wall, planning to surrender to U.S. Border Patrol agents and apply for asylum, as she crosses from Playas de Tijuana, Mexico, Monday, Dec. 3, 2018. Often within minutes, border guards quickly arrive to escort migrants to detention centers and begin "credible fear" interviews. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
Yesenia Martinez, 24, carries her eight-month-old son Daniel as she looks for a place to cross the U.S. border wall to surrender to border patrol and request asylum, in Tijuana, Mexico, Friday, Dec. 7, 2018. Martinez surrendered to waiting border guards while her partner Joel Mendez stayed behind in Tijuana to work, saying he feared he'd be deported if he crossed. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
Salvadoran migrant Cesar Jobet, right, and Daniel Jeremias Cruz hide from U.S. border agents after they dug a hole in the sand under the border wall and crossed over to the U.S. side, in Playas de Tijuana, Mexico, Friday, Nov. 30, 2018. When the two youths were detected by agents they ran back to the Mexican side. (AP Photo/Ramon Espinosa)
By: Ramon Espinosa
In a photo taken from Playas of Tijuana, Mexico, Honduran migrants climb over a section of the U.S. border fence before handing themselves in to border control agents, Sunday, Dec. 2, 2018. A steady trickle of Central American migrants have been finding ways to climb over, tunnel under or slip through the U.S. border wall to plant their feet on U.S. soil and ask for asylum. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
A woman holding a baby peers through the U.S. border fence as she tries to reach a point where scores of migrants have been crossing in recent days, now blocked by private security, in Playas de Tijuana, Mexico, Wednesday, Dec. 5, 2018. Legal groups argue that federal law states that immigrants can apply for asylum no matter how they enter U.S. territory. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
A woman and child migrant start up a hill in San Ysidro, California after climbing over the U.S. border wall from Playas de Tijuana, Mexico, where many migrants expecting to surrender to U.S. border guards were crossing, Monday, Dec. 3, 2018. Discouraged by long waits at ports of entry and sometimes fearing for their lives, migrants are loath to accept the alternative. (AP Photo/Rebecca Blackwell)
By: Rebecca Blackwell
Central American migrants planning to surrender to U.S. border patrol agents climb over the U.S. border wall from Playas de Tijuana, Mexico, late Monday, Dec. 3, 2018. Thousands of migrants are living in crowded tent cities in the Mexican city of Tijuana after undertaking a grueling, weeks-long journey to the U.S. border. (AP Photo/Rebecca Blackwell)