 The department has been the subject of disputes over proper accounting for Native American Trusts set up to track the income and distribution of monies that are generated by the trust and specific Native American lands, which the government leases for fees to companies that extract oil, timber, minerals, and other resources.Several cases have sought an accounting of such funds from departments within the Interior and Treasury (such as the Minerals Management Service), in what has been a 15-year-old lawsuit.Some Native American nations have also sued the government over water-rights issues and their treaties with the US.