A law professor who long has studied public lands governance says Interior Secretary Ryan Zinke lacks the authority to order the National Park Service to weaken its wildlife management regulations, if necessary, to bring them in line with state guidelines.
The Interior secretary issued the order earlier this month, telling the bureaus under him that he "reaffirms" a 1983 policy that gives the states the authority "to exercise their broad trustee and police powers as stewards of the Nation's fish and wildlife species on public lands and waters under the jurisdiction of the Department."
https://www.nationalparkstraveler.org/2018/09/law-professor-interior-secretary-cant-order-national-park-service-weaken-wildlife-regs