Some of them crossed the border in the USA alone, but an increasing number have been separated from their families who crossed illegally.
Outrage over the policy has grown, with Trump attempting to distance himself from the separations, falsely claiming that Democrats - who are in the minority in both houses of Congress - are to blame for his own policy.
Beto O'Rourke on Sunday railed against the Trump administration separating children from parents at the border, but said responsibility for what is happening is on everyone. The Tornillo site will be the only location, to date, where HHS plans to put children in tents, or what the agency calls "semi-permanent structures". They don't need Democrats in order to change it. As Soboroff wrote on Twitter, although "there are no cells and no cages, and they get to go to classes about American history and watch Moana ... they're in custody".
Overall, the Trump administration is considering using the controversial method to house between 1,000 and 5,000 children at different military bases around Texas. These children are "allowed outside, Chris, where we are, in the fresh air, for two hours a day", he said. And he's doing this as punishment for parents trying to seek a better life for their children. "For me it's not a political issue, it's a mother issue, it's a neighbor issue, it's a what's right issue".
Kennedy marching with protesters in Tornillo, Texas.
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DHS said between April 19 and May 31, there were 1,995 children separated from 1,940 adults at the southwest border. Next week, the House of Representatives will consider two immigration bills, a bill sponsored by Rep.
The family separation policy is imposed by the White House. "This really isn't a Republican or Democratic issue". "I want that person to say it to my face", she said.
Once the crowd stopped at the port of entry, MA representative Joe Kennedy surprised the crowd, later saying the exact nature of the unaccompanied minors in the center is uncertain.
"We want to show you that these are not kids kept in cages", said Southwest Key spokeswoman Alexia Rodriguez, with a smile. They planned to investigate the CBP's practice of referring all immigrants for criminal processing at the border, even if they have valid asylum claims that could legally be made under USA law.
Between April 19 and May 31 of this year, 1,995 children were separated from their undocumented parents or adult guardians, according to DHS.