In August of 2012, the Cherokee Nation filed suit against the U.S. Department of the Interior because of its decision to allow the United Keetoowah Band ("UKB") to have trust land ("Indian country") of its own within the boundaries of the Cherokee Nation. In fact, the land in question is located in the heart of the Cherokee Nation's capital - Tahlequah, Oklahoma. That lawsuit, which the UKB has been allowed to join, is currently pending in the federal court in Tulsa and the main documents in the case can be found in the link below.
Additionally, there is a case pending in the Interior Board of Indian Appeals regarding the 76 acre tract, that is the current location of the UKB tribal headquarters. This matter is pending a decision by the Board.
Northern District of Oklahoma- Case No. 12-CV-493 (2 acre tract)
Northern District of Oklahoma- Case No. 14-CV-00019 (76 acre tract)