In recent public comments, Obama has voiced increasing skepticism of the Keystone XL, questioning its benefit to most Americans as well as its impact on the climate. Environmentalists have praised Obama’s veto threat. In a statement, the Rainforest Action Network said, “This is a testament to the dedication and resolve of millions of grassroots activists who have for years fought to stop this pipeline, against all odds.” The Center for Biological Diversity added, “It’s encouraging to see President Obama stand up to the bullies in Congress who want to ram this project through. … [H]ere’s hoping this is his first step toward killing this project once and for all.”