Children line up to enter a tent at the Homestead Temporary Shelter for Unaccompanied Children in Homestead, Fla., in Feb. 2019 The American Civil Liberties Union and other attorneys filed a lawsuit on behalf of thousands of immigrant families who were separated at the U.S.-Mexico border on Oct. 3, 2019. Wilfredo Lee/AP hide caption
The Trump-era "zero tolerance" immigration policy has resulted in the separation of more than 3,000 children from their families after crossing the U.S.-Mexico border. Ross D. Franklin/AP hide caption
Migrant children line up to enter a tent at the Homestead Temporary Shelter for Unaccompanied Children in Homestead, Fla. in February 2019. Wilfredo Lee/AP hide caption
Immigrants walk into a building at South Texas Family Residential Center in Dilley, Texas. Charles Reed/AP hide caption
A Brazilian mother, who asked to be identified only as W.R., was reunified with with her 9-year-old son A.R. in Boston on July 16. Michael Dwyer/AP hide caption
Ruben Garcia (center), director of the Annunciation House, speaks with migrant parents on June 26, 2018, in El Paso, Texas. Matt York/AP hide caption
Kevin Sinatra and Aida Cardoza brought their 1-year-old son Matthews to the protest. "We want him to know he's was a part of this movement." Eman Mohammed for NPR hide caption
The train known as "The Beast" passes by the Sagrada Familia shelter in Apizaco, Mexico. For many migrants, the train is the next step in their journey north. Alejandro Cegarra for NPR hide caption
A screenshot from a video produced by ProPublica about 6-year-old Alison Jimena Valencia Madrid who had just crossed into the U.S. before she was detained and separated from her mother. An audio recording of Alison pleading for someone to call her aunt sparked national outcry and condemnation. ProPublica/Screenshot by NPR hide caption