He didn't tell them not to enforce immigration law. He told them what priorities he wanted for their limited time, budget and resources, which is perfectly legitimate for any chief executive to do.
Really? Agents were told if an illegal claimed to meet his dreamer qualification they were to be released, no verifications required. How about we apply those standards to other crimes, you know, if they say they didn't do it, screw it, let them go. Sure we can call it enforcement, by commiecrat standards. No prosecutor has the authority to exempt a whole class of criminals from prosecution, based on prosecutorial discretion, that includes your dear leader.