There should be no “let” about it. It was created by Executive Order and should end with an EO terminating program. No special rights vested.
Actually, it wasn't even an EO. It was just a memo published by the wonderfully Orwellian-named Department of Homeland Security. A memo, stating the department's intent not to enforce the law against a specific class of criminals. That's all it was. The courts have so completely screwed up our country that an executive agency can't change policy now unless the liberals and other assorted communists agree with it ahead of time.