Migrants stand in line after being released from U.S. Customs and Border Protection custody at a bus station, Wednesday, March 17, 2021, in Brownsville, Texas. Team Brownsville, a humanitarian group, is helping the migrants reach their final destination in the U.S. A surge of migrants on the Southwest border has the Biden administration on the defensive. An official says U.S. authorities encountered nearly double the number children traveling alone across the Mexican border in one day this week than on an average day last month. (AP Photo/Julio Cortez)

Migrant children are seen with adults as they wait in line to get a COVID-19 test before given travel instructions at a bus station, Wednesday, March 17, 2021, in Brownsville, Texas. A surge of migrants on the Southwest border has the Biden administration on the defensive. The head of Homeland Security acknowledged the severity of the problem Tuesday but insisted it's under control and said he won't revive a Trump-era practice of immediately expelling teens and children. An official says U.S. authorities encountered nearly double the number children traveling alone across the Mexican border in one day this week than on an average day last month. (AP Photo/Julio Cortez)

Sen. Ted Cruz, R-Texas, speaks during a Senate Committee on Homeland Security and Governmental Affairs and Senate Committee on Rules and Administration joint hearing Wednesday, March 3, 2021, examining the January 6, attack on the U.S. Capitol in Washington. (Greg Nash/Pool via AP)