Migrant children and teenagers from the southern border of the United State wait to be processed after entering the site of a temporary holding facility Sunday, March 14, 2021 south of Midland, Texas. (Eli Hartman/Odessa American via AP)

FILE - In this March 31, 2020, file photo, a sign sits in front of the Kay Bailey Hutchison Convention Center in downtown Dallas. The U.S. government wants to house up to 3,000 immigrant teenagers at the center as it struggles to find space for a surge of migrant children who have inundated the border and strained the immigration system just two months into the Biden administration. (AP Photo/Tony Gutierrez File)

FILE - In this Sunday, March 14, 2021, file photo, migrant children and teenagers are processed after entering the site of a temporary holding facility south of Midland, Texas. Teenagers began arriving Sunday at a converted camp for oilfield workers where volunteers from the American Red Cross will care for them. (Eli Hartman/Odessa American via AP, File)

FILE - In this Monday, March 1, 2021 file photo, Homeland Security Secretary Alejandro Mayorkas speaks during a press briefing at the White House in Washington. The Biden administration is turning to the Federal Emergency Management Agency for help managing and caring for record numbers of unaccompanied immigrant children who are streaming into the U.S. from Mexico. Homeland Security Secretary Alejandro Mayorkas says FEMA will support a government-wide effort over the next three months, Saturday, March 13, 2021. (AP Photo/Andrew Harnik, File)

Department of Homeland Security officers talk to the driver of a bus carrying migrant children and teenagers from the southern border of the United States as it waits to enter the site of a temporary holding facility that opened on Sunday, March 14, 2021 south of Midland, Texas. (Eli Hartman/Odessa American via AP)

FILE - In this Aug. 23, 2019 file photo, immigrants seeking asylum walk at the ICE South Texas Family Residential Center, in Dilley, Texas. The U.S. government plans to use the downtown Dallas convention center to hold up to 3,000 immigrant teenagers as sharply higher numbers of border crossings have severely strained the current capacity to hold youths, according to a memo obtained by The Associated Press.  The Kay Bailey Hutchison Convention Center will be used for up to 90 days beginning as early as this week, according to the written notification sent to members of the Dallas City Council on Monday, March 15, 2021. (AP Photo/Eric Gay, File)

Secretary of Homeland Security Alejandro N. Mayorkas gestures during a media tour at the Pennsylvania Convention Center in Center City Philadelphia on Tuesday, March 2, 2021. Mayorkas was in Philadelphia for the media tour of the FEMA Community Vaccination Center. (Alejandro A. Alvarez/The Philadelphia Inquirer via AP)