Central American migrants are seen inside an enclosure where they are being held by U.S. Customs and Border Protection (CBP), after crossing the border between Mexico and the United States illegaly and turning themselves in to request asylum, in El Paso, Texas, U.S. March 27, 2019.

A migrant from Honduras helps his child get dressed after a bath in a river during a break in his journey towards the United States, in Huixtla, Mexico April 16, 2019.

Migrant children play soccer as their asylum-seeking families wait in hopes of being let through the nearby U.S. port of entry at a makeshift migrant camp near the Gateway International Bridge in Matamoros, Tamaulipas, Mexico, June 26, 2019.

A Central American child plays on a hallway of the Catholic shelter "San Francisco Javier Church", which gives temporary shelter to asylum-seekers from Central America countries released by ICE and U.S. Customs and Border Protection (CBP) due to overcrowded facilities, in Laredo, Texas U.S. June 4, 2019.

A young girl, part of a group of Central American migrants seeking asylum, walks along a stretch of border fence after illegally crossing the Rio Grande near Penitas, Texas, U.S., April 6, 2019. Picture taken April 6, 2019.

A migrant child disembarks a U.S. Border Patrol bus at the processing center and shelter in Deming, New Mexico, U.S. May 27, 2019. Picture taken May 27, 2019.

Relatives carry the coffin with the body of 2-1/2-year-old Guatemalan migrant Wilmer Josue Ramirez, who was detained last month at the U.S.-Mexico border but released from U.S. custody with his mother during treatment for an illness, toward the cemetery during his funeral in the village of Olopa, Guatemala May 26, 2019.

A woman from Central America bathes a child inside the "House of the Refugee", which gives temporary shelter to migrants released by ICE and U.S. Customs and Border Protection (CBP) due to overcrowded facilities, in El Paso, Texas, U.S. April 24, 2019.

Staff of a funeral parlor load a casket containing the body of 2-1/2-year-old Guatemalan migrant Wilmer Josue Ramirez, who was detained last month at the U.S.-Mexico border but released from U.S. custody with his mother during treatment for an illness, into a funeral hearse at La Aurora International Airport in Guatemala City, Guatemala May 24, 2019.

Salvadoran migrant child, Lupe, sits on a bus as she leaves the premises of the National Migration Institute (INM) after being deported from the United States, in Ciudad Juarez, Mexico June 22, 2019.

Asylum-seeking children receive toys from volunteers as they wait in hopes of being let through the nearby U.S. port of entry in a makeshift migrant camp near the Gateway International Bridge in Matamoros, Tamaulipas, Mexico, June 29, 2019.

Migrants arrive at the premises of the National Migration Institute (INM) after being deported from the United States, in Ciudad Juarez, Mexico June 17, 2019.

Sonia, an asylum seeker from Honduras, waits with sleeping six-year-old son Yankel and daughter Yarisleidy, twins, before boarding a bus with fellow migrant families recently released from detention at a bus depot in McAllen, Texas, U.S., May 20, 2019.

A woman protests against migrants outside a processing center and shelter in Deming, New Mexico, U.S. May 27, 2019.

Migrants from Guatemala are seen on the banks of the Rio Bravo river as they cross illegally into the United States to turn themselves in to request asylum in El Paso, Texas, as seen from Ciudad Juarez, Mexico June 6, 2019.

A child looks from inside a migration facility in Tapachula, Mexico, May 9, 2019.

Central American migrant children look at the Rio Bravo near the Brownsville-Matamoros International Bridge where they camp nearby, at the U.S.-Mexico border in Matamoros, Tamaulipas, Mexico, Mexico June 27, 2019.

A group of Central American migrants is questioned about their children's health after surrendering to U.S. Border Patrol Agents south of the U.S.-Mexico border fence in El Paso, Texas, U.S., March 6, 2019.

A man plays gives children rocks to play with inside an enclosure, where they are being held by U.S. Customs and Border Protection (CBP), after crossing the border between Mexico and the United States illegally and turning themselves in to request asylum, in El Paso, Texas, U.S., March 29, 2019.

A young girl from Nicaragua reacts as a member of Mexico's National Guard looks at papers after detaining her, her mother and another woman, while trying to cross illegally the border between the U.S. and Mexico, in Ciudad Juarez, Mexico June 21, 2019.

Catarina Alonzo, mother of Felipe Gomez Alonzo, a 8-year-old boy who died in the custody of U.S. Customs and Border Protection (CBP), after being detained along with his father for illegally entering to the U.S, looks into the coffin with the remains of her son during his funeral at a home village of Yalambojoch, Guatemala January 27, 2019.

A little boy and his father wear shoelaces made out of foil blankets before entering a temporary shelter after illegally crossing with fellow Central American migrants the border between Mexico and the U.S., in Deming, New Mexico, U.S., May 16, 2019.

Guatemalan migrants Ismelda Cipriano, 31, and her daughter Petronila Cipriano, 12, sit in a truck after surrendering to U.S. Border Patrol Agents in El Paso, Texas, U.S., March 5, 2019.

Migrants from Central America sleep on the floor at Miguel Hidalgo Central Park in Tapachula, Mexico, May 11, 2019.

Girls from Congo eat outside their tent at an improvised camp outside the premises of the National Migration Institute (INM), in Tapachula, Mexico April 7, 2019.

A man holds a child inside an enclosure, where they are being held by U.S. Customs and Border Protection (CBP), after crossing the border between Mexico and the United States illegally and turning themselves in to request asylum, in El Paso, Texas, U.S., March 29, 2019.

African and Haitian migrants ask for water to nuns from Misioneras de Cristo Resucitado (not pictured) in Tapachula, Mexico, May 15, 2019.

Migrants are seen outside the U.S. Border Patrol McAllen Station in a makeshift encampment in McAllen, Texas, U.S., May 15, 2019.

Honduran asylum seeker Ondina Guevara sits with one year-old son Joshua Caleb in a makeshift migrant camp as they wait in hopes of being let through the nearby U.S. port of entry at the Gateway International Bridge in Matamoros, Tamaulipas, Mexico, June 26, 2019.

A drawing by migrant children recently released from CBP depicting their time spent in U.S. Customs and Border Protection (CBP) custody, to the Catholic Charities Humanitarian Respite Center in McAllen, Texas, are shown in this image released by American Academy of Pediatrics in Itasca, Illinois, U.S., on July 3, 2019. Courtesy American Academy of Pediatrics/Handout via REUTERS

A U.S. border patrol boat rescues migrants crossing the Rio Bravo towards the United States, seen from Piedras Negras, Mexico, February 10, 2019.

A migrant from Central America talks with his famiy by a river during a break in his journey towards the United States, in Huixtla, Mexico April 16, 2019.

A stroller abandoned by Central American migrants is seen after an immigration raid in their journey towards the United States, in Pijijiapan, Mexico April 22, 2019.

Paola, an asylum seeker from Honduras, carries four year-old son Jesse as they wait in a ticketing line with fellow migrant families recently released from detention at a bus depot in McAllen, Texas, U.S., May 19, 2019.

Emergency Medical Technician (EMT) Tyler G. Massey ties a migrant child's shoe at a shelter in Deming, New Mexico, U.S. May 27, 2019. Picture taken May 27, 2019.

Migrants from Central America cross the Rio Bravo river to enter illegally into the United States to turn themselves in to request for asylum in El Paso, Texas, U.S., as seen from Ciudad Juarez, Mexico June 12, 2019.

Migrants are pictured after crossing illegally to the United States to turn themselves in to request asylum to U.S. Customs and Border Protection (CBP) officials in El Paso, Texas, as seen from Ciudad Juarez, Mexico April 17, 2019.