The U.S. Court of Appeals for the 5th Circuit denied Wednesday the request by AARP and state attorney's general from California, New York and Oregon to intervene after the court ruled to vacate the Labor Department fiduciary rule.

The court did not explain its order, stating that the motions were denied.

AARP told the court Tuesday that the Labor Department's failure to appeal the court's ruling vacating the rule opened the door for intervention by the retiree advocacy group.