A federal judge on Monday temporarily blocked the U.S. Department of Homeland Security’s rule limiting international student visas to four years, a regulatory change that would have taken effect Tuesday. In his 48-page ruling, U.S. District Judge F. Dennis Saylor said a lawsuit against DHS is “likely to succeed” on several grounds and that colleges would suffer “immediate irreparable harm” if the rule took effect during the case. Among the issues Saylor flagged were concerns that the rule could be used inappropriately by the Trump administration. “It is not difficult to imagine how that system might be abused to punish those whose viewpoints or research are disfavored by the officials making the decision — or, indeed, punish disfavored institutions,” Saylor said.