Rationales for opposition include the belief that the war is illegal according to the United Nations Charter, or would contribute to instability both within Iraq and the wider Middle East. Critics have also questioned the validity of the war's stated objectives, such as a supposed link between the country's Ba'athist government and the September 11, 2001 attacks on the United States, and its possession of weapons of mass destruction "certified" by the Niger uranium forgeries. The latter was claimed by the United States during the run-up to the war, but no such weapons have since been found.