Montana officials have made good on legal threats to sue the National Park Service over what they say is mismanagement of its growing bison herd.

Gov. Greg Gianforte and two state agencies are suing the federal government. They argue Yellowstone National Park’s new bison management plan violates federal law.

Montana Gov. Greg Gianforte is suing to halt Yellowstone National Park's bison management plan, according to a lawsuit on Tuesday, Dec. 31.

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.

Governor Greg Gianforte and two state agencies have filed a lawsuit against the National Park Service and its bison management plan at Yellowstone National Park. Gianforte is issu

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.