FILE - In this March 30, 2021, file photo, young unaccompanied migrants wait for their turn at the secondary processing station inside the U.S. Customs and Border Protection facility, the main detention center for unaccompanied children in the Rio Grande Valley, in Donna, Texas. U.S. authorities say they picked up nearly 19,000 children traveling alone across the Mexican border in March. It's the largest monthly number ever recorded and a major test for President Joe Biden as he reverses many of his predecessor's hardline immigration tactics. (AP Photo/Dario Lopez-Mills, Pool, File)

FILE - In this March 30, 2021, file photo, young minors lie inside a pod at the Donna Department of Homeland Security holding facility, the main detention center for unaccompanied children in the Rio Grande Valley run by U.S. Customs and Border Protection (CBP), in Donna, Texas. U.S. authorities say they picked up nearly 19,000 children traveling alone across the Mexican border in March. It's the largest monthly number ever recorded and a major test for President Joe Biden as he reverses many of his predecessor's hardline immigration tactics. (AP Photo/Dario Lopez-Mills, Pool, File)

FILE - In this March 19, 2021, file photo, migrants are seen in custody at a U.S. Customs and Border Protection processing area under the Anzalduas International Bridge, in Mission, Texas. U.S. authorities say they picked up nearly 19,000 children traveling alone across the Mexican border in March. It's the largest monthly number ever recorded and a major test for President Joe Biden as he reverses many of his predecessor's hardline immigration tactics. (AP Photo/Julio Cortez, File)

FILE - In this March 30, 2021, file photo, young unaccompanied migrants, from ages 3 to 9, watch television inside a playpen at the U.S. Customs and Border Protection facility, the main detention center for unaccompanied children in the Rio Grande Valley, in Donna, Texas. U.S. authorities say they picked up nearly 19,000 children traveling alone across the Mexican border in March. It's the largest monthly number ever recorded and a major test for President Joe Biden as he reverses many of his predecessor's hardline immigration tactics. (AP Photo/Dario Lopez-Mills, Pool, File)

FILE - In this Sunday, March 28, 2021, file photo, Carlos Enrique Linga Rivera, 27, and his daughter Betty Noemi, 5, talk to The Associated Press while waiting at Our Lady of Guadalupe Catholic Church in Mission, Texas, on Palm Sunday. U.S. authorities are releasing migrant families at the border without notices to appear in immigration court and sometimes, like in the case of Rivera, without any paperwork at all. (AP Photo/Dario Lopez-Mills, File)