A migrant woman carries a child while in custody at a U.S. Customs and Border Protection processing area under the Anzalduas International Bridge, Friday, March 19, 2021, in Mission, Texas. The fate of thousands of migrant families who have recently arrived at the Mexico border is being decided by a mysterious new system under President Joe Biden. U.S. authorities are releasing migrants with “acute vulnerabilities” and allowing them to pursue asylum. But it’s not clear why some are considered vulnerable and not others. (AP Photo/Julio Cortez)