Migrants seeking refuge in the U.S. wade through the Rio Grande river from Ciudad Acuna, Mexico toward Del Rio, Texas, U.S. while carrying supplies, in Ciudad Acuna, Mexico September 21, 2021.

DPS Texas helicopter patrols near the border between Ciudad Acuna, Mexico and Del Rio, Texas, U.S., as migrants seeking refuge into the United States cross the Rio Grande river, in Ciudad Acuna, Mexico, September 20, 2021.

Children play on a swingset in a makeshift migrant camp near the border with the U.S., in Ciudad Acuna, Mexico September 21, 2021.

A U.S. Border Patrol agent keeps watch on the banks of the Rio Grande river, border between Ciudad Acuna, Mexico and Del Rio, Texas, U.S., as migrants seeking refuge into the United States cross the river, in Ciudad Acuna, Mexico September 20, 2021.

Haitian migrants react after U.S. authorities flew them out of a Texas border city after crossing the Rio Grande river from Mexico, at Toussaint Louverture International Airport in Port-au-Prince, Haiti September 21, 2021.

Some migrants are separated from others as they are prepared for transport as others await to be processed in a makeshift camp along the International Bridge in Del Rio, Texas, U.S. September 21, 2021. Picture taken with a drone.

Migrants seeking refuge in United States cross the Rio Grande river, with bags and children in tow, back into Ciudad Acuna, Mexico from their camp in Del Rio, Texas, U.S. September 21, 2021. Picture taken with a drone.

A Texas State Police officer watches over the Rio Grande river near the International Bridge between Mexico and the U.S., where migrants seeking asylum in the U.S. are waiting to be processed, in Del Rio, Texas, U.S., September 21, 2021.

Migrants take shelter along the Del Rio International Bridge at sunset as they await to be processed after crossing the Rio Grande river into the U.S. from Ciudad Acuna in Del Rio, Texas, U.S. September 19, 2021.

A Haitian passport is seen in a pile of trash near the International Bridge between Mexico and the U.S., where migrants seeking asylum in the U.S. are waiting to be processed, in Del Rio, Texas, U.S., September 21, 2021.

Some thousands of migrants take shelter as they await to be processed near the Del Rio International Bridge after crossing the Rio Grande river into the U.S. from Ciudad Acuna in Del Rio, Texas, U.S. September 18, 2021. Picture taken with a drone.

Migrants seeking asylum in the U.S. take shelter in make-shift migrant camp near the International Bridge between Mexico and the U.S., as they wait to be processed, in Del Rio, Texas, U.S. September 21, 2021.

Migrants shelter in a makeshift camp near the border with the U.S., in Ciudad Acuna, Mexico September 21, 2021.

Migrants seeking refuge in U.S., hold up a blanket to protest about the situation they are living in the border between Ciudad Acuna and Del Rio, Texas, U.S., near the banks of the Rio Grande river, in Ciudad Acuna, Mexico September 20, 2021.

A migrant sits in his shelter after waking up amid others awaiting to be processed in a make shift camp along the International Bridge, in Del Rio, Texas, U.S. September 21, 2021. Picture taken with a drone.

Migrants shelter in a makeshift camp near the border with the U.S., in Ciudad Acuna, Mexico September 21, 2021.

A U.S. border patrol officer grabs the shirt of a migrant trying to return to the United States along the Rio Grande river, after having crossed from the United States into Mexico to buy food, as seen from Ciudad Acuna, in Ciudad Acuna, Mexico September 19, 2021.

Haitian migrants try to return to the airplane used by U.S. authorities to fly them out of a Texas border city after crossing the Rio Grande river from Mexico, at Toussaint Louverture International Airport in Port-au-Prince, Haiti September 21, 2021.

A migrant mother seeking asylum in the U.S. holds her 15 days old baby in a make-shift migrant camp near the International Bridge between Mexico and the U.S., as they wait to be processed, in Del Rio, Texas, U.S. September 21, 2021.

A Haitian migrant is calmed by Haitian authorities after U.S. authorities flew migrants out of a Texas border city after crossing the Rio Grande river from Mexico, at Toussaint Louverture International Airport in Port-au-Prince, Haiti September 21, 2021.