Migrants, under the Migrant Protection Protocols (MPP) program, wait to take a test for coronavirus at the Leona Vicario temporary migrant shelter, before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico March 1, 2021.

Last month, the Biden administration announced plans for tens of thousands of asylum-seekers waiting in Mexico for their next immigration court hearings to be allowed into the United States while their cases proceed.

A migrant child from Central America, under the Migrant Protection Protocols (MPP) program, stands at the Leona Vicario temporary migrant shelter before being transferred to continue the asylum request in the United States, in Ciudad Juarez, Mexico, Feb. 26, 2021.

Migrants from Central America, under the Migrant Protection Protocols (MPP) program, walk across the Paso del Norte international border bridge from the Mexican side to continue their asylum request in the United States, in Ciudad Juarez, Mexico Feb. 26, 2021.

Migrants from Central America, under the Migrant Protection Protocols (MPP) program, wait to be tested for the coronavirus at the Leona Vicario temporary migrant shelter, before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico, Feb. 26, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, wait to be tested for the coronavirus at the Leona Vicario temporary migrant shelter, before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico, March 1, 2021.

A migrant girl from Central America, under the Migrant Protection Protocols (MPP) program, looks out a bus window as she is taken to a shelter after crossing from Mexico into the U.S. to continue her asylum request in the United States, in El Paso, Texas, U.S., Feb. 26, 2021.

Activists accompany migrants from Central America, under the Migrant Protection Protocols (MPP) program, after they crossed from Mexico into the U.S. to continue their asylum request in the United States, in El Paso, Texas, U.S., Feb. 26, 2021.

Migrants under the Migrant Protection Protocols (MPP) program wait to be tested for the coronavirus at the Leona Vicario temporary migrant shelter, before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico, March 1, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, walk across the Paso del Norte international border bridge from the Mexican side to continue their asylum request in the United States, in Ciudad Juarez, Mexico, March 1, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, walk across the Paso del Norte international border bridge from the Mexican side to continue their asylum request in the United States, in Ciudad Juarez, Mexico, March 1, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, walk after crossing from Mexico into the U.S. to continue their asylum request in the United States, in this picture taken in Ciudad Juarez, Mexico, March 1, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, walk across the Paso del Norte international border bridge from the Mexican side to continue their asylum request in the United States, in Ciudad Juarez, Mexico, March 1, 2021.