The Supreme Court on Thursday evening largely left in place an order by a federal judge in Maryland directing the government to return to the United States a Maryland man who is currently being held in a maximum-security prison in El Salvador as a result of what the Trump administration concedes was an “administrative error.” In an unsigned opinion without any recorded dissents, the court turned down the Trump administration’s request to block the ruling by U.S. District Judge Paula Xinis, which Chief Judge John Roberts had temporarily paused on Monday afternoon to give the justices time to consider the government’s request.