A controversial ballot measure backed by Republicans in the state legislature is seeking sovereign control over millions of acres of federal land in the state, including the Grand Canyon.

Proposition 120 would amend the state's constitution to declare Arizona's sovereignty and jurisdiction over the "air, water, public lands, minerals, wildlife and other natural resources within the state's boundaries."

The measure is the latest salvo in the so-called "sagebrush revolt" by Republicans in the West aiming to take back control of major swaths of land owned by various federal agencies, much of it by the Interior Department's Bureau of Land Management.

State Senator Sylvia Allen, one of the Republican backers of the measure, argues that federal retention of the land hurts the economy of the Western states and leaves them struggling to fund public education, nurture their economies, and manage their forests and natural resources.