Where is the line between “deference owed to the Executive Branch” and defiance of a court order? That’s a question in the case of a Salvadoran illegal immigrant, Kilmar Armando Abrego Garcia. In March he was deported to a prison in his native land due to an “administrative error,” the Justice Department says. The Supreme Court on Thursday said America must “facilitate” — whatever that means — Mr. Abrego Garcia’s release.