In this March 24, 2021 photo, migrant families, mostly from Central American countries, wade through shallow waters after being delivered by smugglers on small inflatable rafts on U.S. soil in Roma, Texas. The Biden administration said Monday that four families that were separated at the Mexico border during Donald Trump's presidency will be reunited in the United States this week in what Homeland Security Secretary Alejandro Mayorkas calls “just the beginning” of a broader effort. (AP Photo/Dario Lopez-Mills)

In this March 24, 2021 photo, a migrant man, center, holds a child as he looks at a U.S. Customs and Border Protection agent at an intake area after crossing the U.S.-Mexico border, early Wednesday, March 24, 2021, in Roma, Texas. The Biden administration said Monday that four families that were separated at the Mexico border during Donald Trump's presidency will be reunited in the United States this week in what Homeland Security Secretary Alejandro Mayorkas calls “just the beginning” of a broader effort. (AP Photo/Julio Cortez)