or other brown bear subspecies, subject to the conditions that the Secretary shall not— (1) add any distinct population segment of grizzly bear (Ursus arctos horribilis) to the List of Endangered and Threatened Wildlife under section 17.11(h) of title 50, Code of Federal Regulations (or a successor regulation), unless the Secretary identifies objective, measurable criteria that, when met, would result in a determination that the distinct population segment be removed from the list