A federal judge on Wednesday barred the Trump administration from continuing to detain Mahmoud Khalil under a rarely cited law invoked by the secretary of state — and suggested that Mr. Khalil could be released as early as Friday. However, the judge, Michael E. Farbiarz, paused his own order to give the administration a chance to appeal, saying it would not go into effect until 9:30 a.m. on Friday. And he left a pathway for the government to continue to detain Mr. Khalil for other reasons, though he suggested he would be skeptical were authorities to do so. ***Though Judge...