A federal judge has temporarily blocked a new Trump administration policy to keep migrant children in detention after they turn 18, moving quickly to stop transfers to adult facilities that advocates said were scheduled for this weekend. The Washington, D.C., judge found that such automatic detention violates a court order he issued in 2021 barring such practices. Last month a separate federal judge blocked attempts to immediately deport Guatemalan migrant children who came to the U.S. alone back to their home country. Some children had been put on board planes in that late-night operation before a judge blocked it. A 2008 law requires them to appear before an immigration judge before being returned to their countries.