Rabbis, priests, other clergy and lay leaders drove from Michigan to Texas to hold a rally at the Tornillo detention camp.
“It never really seemed like there was much education," one former employee at a center for migrant children said.
“Once you’re strapped down, they have total control over you,” a Honduran child said about being restrained in a chair for hours at a Virginia facility.
Some 300,000 children traveled alone worldwide from 2015 to 2016.
The children’s plight has triggered a diplomatic row between Paris and London, with tensions intensifying after President Hollande pressed Britain to accept its share of responsibility for the minors.
But legal groups say virtually all unaccompanied minors from Central America qualify for humanitarian relief.
While the critical subject of a runaway U.S. criminal justice system is gaining momentum toward reforms, the Obama Administration is vigorously defending the mass detention of non-U.S. citizens, including the detention of women and children.