TULSA, Okla. (AP) A federal order for one of the nation's largest American Indian tribes to restore voting rights and benefits to about 2,800 descendants of members' former slaves threw plans for a special election for a new chief into turmoil Tuesday.

The federal government sent the sternly-worded letter to the Cherokee Nation after it sent letters last week kicking the descendants out of the tribe and stripping them of benefits including medical care, food stipends and assistance for low-income homeowners.

The tribe also barred the descendants from voting in a Sept. 24 special election for principal chief. The Cherokee Supreme Court ordered the special election after it said it could not determine with certainty the outcome of a close and hotly contested June election between incumbent Chad Smith and longtime tribal councilman Bill John Baker. The results had flip-flopped between the two during weeks of counts and recounts. Baker had twice been declared winner, but so had Smith.

The federal government said that unless the descendants, known as freedmen, were allowed to vote, the upcoming election wouldn't be valid.

"I urge you to consider carefully the nation's next steps in proceeding with an election that does not comply with federal law," Assistant Secretary for Indian Affairs Larry Echo Hawk wrote in letter Friday to acting Chief S. Joe Crittenden. "The department will not recognize any action taken by the nation that is inconsistent with these principles and does not accord its freedmen members full rights of citizenship."

Crittenden said the special election would take place as scheduled.

"The Cherokee Nation will not be governed by the (Bureau of Indian Affairs)," he said. "We will hold our election and continue our long legacy of responsible self-governance."

The election has drawn national interest because while the tribe is based in Tahlequah, many of its 300,000 members live outside Oklahoma.

The freedmen have asked a federal judge to restore their voting rights before the special election, and a hearing is planned next week in federal court in Washington.

The tribe never owned black slaves, but some individual members did. They were freed after the Civil War, in which the tribe allied with the Confederacy. An 1866 treaty between the tribe and the federal government gave the freedmen and their descendants "all the rights of native Cherokees."

More than 76 percent of Cherokee voters approved a 2007 amendment removing the freedmen and other non-Indians from the tribal rolls, but no action was taken until the tribe's Supreme Court upheld the results of that special election last month. Cherokee leaders who backed the amendment, including Smith, said the vote was about the fundamental right of every government to determine its citizens, not about racial exclusion.

But the Department of the Interior said Tuesday that it still believes the expulsion is unconstitutional because it violates the 1866 treaty.

Marilyn Vann, president of the Descendants of Freedmen of the Five Civilized Tribes, said she hopes the federal order will result in the election being delayed.

"The freedmen people still have rights in the tribe such as voting," Vann said Tuesday. "We'll have our day in court."

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