By BLAKE NICHOLSON, Associated Press

BISMARCK, N.D. (AP) — Another American Indian tribe is challenging North Dakota's voter identification requirements, which many Native Americans allege discriminate against them and suppress their vote.

The Standing Rock Sioux has signed on to a lawsuit that the Spirit Lake Sioux filed just days before last November's general election.

The heart of the dispute is the state requirement that a voter ID include a provable street address. The state maintains the requirement aims to prevent fraud. Tribes say it disenfranchises members who live on reservations where street addresses are uncommon or unknown and where post office boxes are the primary addresses.

The most recent lawsuit was prompted by an October U.S. Supreme Court ruling in a similar lawsuit by Turtle Mountain Band of Chippewa members. The ruling was favorable to the state.