 In 1996, they donated US$107,000 to the Democratic National Committee with a memo titled "Fort Reno," and at the same time asked the Clinton administration to get an opinion from the Department of the Interior on their claims.The U.S. Senate investigated them for their actions in 1997 but the tribes refused to appear without a grant of immunity.In 1999 the Interior Department issued an opinion saying that the tribes did have a credible argument that they did not cede the lands that were used by the military.