Bush insisted in August 2006 that "there must be consequences" for Iran's continued enrichment of uranium. He said that "the world now faces a grave threat from the radical regime in Iran." Ahmadinejad invited Bush to a debate at the UN General Assembly, which was to take place on September 18, 2006. The debate was to be about Iran's right to enrich uranium. The invitation was promptly rejected by White House spokesman Tony Snow, who said "There's not going to be a steel-cage grudge match between the President and Ahmadinejad".