In a unanimous decision authored by Justice Sotomayor on February 26, 2019, the Supreme Court held that the 14-day deadline to seek permission to appeal a decision granting or denying class certification under Federal Rule of Civil Procedure 23(f) cannot be extended through the doctrine of equitable tolling. Nutraceutical Corp. v. Lambert. The Court reversed the Ninth Circuit’s decision, which had accepted a petition filed more than 14 days after the trial court’s decertification order, because the plaintiff had “acted diligently.”