In seeking a preliminary injunction against an employer’s actions pending proceedings before the NLRB, that agency must meet the same four traditional factors outlined in  Winter v. Natural Resources Defense Council, Inc. (2008) 555 U. S. 7:  likelihood of success on the merits, irreparable harm, balance of equities in plaintiff’s favor, and injunction in public interest.  In simply allowing courts to enter temporary relief that the court deems just and proper (NLRA 10(j)), Congress did not adopt any different standard for NLRB injunctions.  That courts review final NLRB decisions deferentially is no reason to grant a preliminary injunction without a traditional showing of likelihood of success on the merits.  Reasonable cause to believe that the defendant violated the NLRA is insufficient.