Mahmoud Khalil, the Columbia University graduate and detained Palestinian activist, was finally allowed to hold his infant son for the first time Thursday – one month after he was born – thanks to a federal judge who blocked the Trump administration’s efforts to keep the father and infant separated by a Plexiglass barrier. The visit came before a scheduled immigration hearing for Khalil, a legal permanent resident who has been detained in a Louisiana jail since 8 March. The question of whether Khalil would be permitted to hold his newborn child, Deen, or forced to meet him through a barrier...