The lawsuit is the latest escalation in a decades-long fight between state and federal officials over how to manage the park's growing bison population.

The National Park Service is killing a controversial plan that would have allowed local land managers to ban climbing anchors in wilderness areas.

Montana state officials are suing National Park over its bison management plan. The case argues that park officials have intentionally cut Montana out of management plans or ignored the park’s science in an effort to boost park bison numbers and avoid vaccinating them against brucel-losis.