 McCain had supported the proposed Yucca Mountain nuclear waste repository in Nevada.In 2008, however, on the eve of a campaign appearance in Nevada, he called for the establishment of "an international repository for spent nuclear fuel", which, he said, might make it unnecessary to open Yucca Mountain.The Sierra Club, the League of Conservation Voters, and the Obama campaign have charged that, in a videotaped interview in 2007, McCain reiterated his support for transporting nuclear waste to Yucca Mountain but said he would not be comfortable with such transports going through Phoenix, Arizona.