 Some arguments have centered on non-Natives being opposed to Natives having access to anything that all Americans cannot have.Defenders of the law have argued it is the only legal protection of American Indian spirituality and that because eagle supplies are limited, increasing the number of people who can have eagle parts may make feathers more scarce as well as endanger the lives of too many migratory birds (including threatened or endangered species).Arguments in favor of amending the law (notably by supporters of Religious Freedom with Raptors, an organization dedicated to changing the eagle feather law) have been made on the grounds that it imposes "racial preferences" for American Indians and that the requirement of tribal enrollment to possess eagles undermines tribal sovereignty rights to fully welcome and include non-Natives in tribal customs involving eagle feathers.