Migrants from Central America, under the Migrant Protection Protocols (MPP) program, wait to take a test for the coronavirus disease (COVID-19) at the Leona Vicario temporary migrant shelter, before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico February 26, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, wait to take a test for the coronavirus disease (COVID-19) 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 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 February 26, 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.

A woman checks the temperature of a child as migrants from Central America, under the Migrant Protection Protocols (MPP) program, wait to take a test for the coronavirus disease (COVID-19) at the Leona Vicario temporary migrant shelter before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico February 26, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, wait to take a test for the coronavirus disease (COVID-19) 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 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 February 26, 2021.

A migrant, under the Migrant Protection Protocols (MPP) program, waits in a tent where she is tested for the coronavirus disease (COVID-19) at the Leona Vicario temporary migrant shelter, before being transferred to continue her asylum request in the United States, in Ciudad Juarez, Mexico March 1, 2021.

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

Migrants from Central America, under the Migrant Protection Protocols (MPP) program, wait to take a test for the coronavirus disease (COVID-19) at the Leona Vicario temporary migrant shelter, before being transferred to continue their asylum request in the United States, in Ciudad Juarez, Mexico February 26, 2021.

Migrants, under the Migrant Protection Protocols (MPP) program, wait at a tent where they are being tested for the coronavirus disease (COVID-19) 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.

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. February 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 February 26, 2021.

Migrants under the Migrant Protection Protocols (MPP) program wait to take a test for the coronavirus disease (COVID-19) 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, carry their suitcase while 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 from 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.

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. February 26, 2021.