Iran said Sunday that demands from the U.N. atomic watchdog that it freeze all uranium enrichment work that can be used for nuclear weapons were "illegal," but left open the possibility it was ready to negotiate on the issue. Hasan Rowhani, Iran's top nuclear negotiator spoke a day after the IAEA governing board issued its demands and said it would judge Tehran's compliance in two months. "We are committed to the suspension of actual enrichment but we have no decision to expand the suspension," Rowhani said. "This demand is illegal and does not put any obligation on Iran. The IAEA board of governors has no right to make such a suspension obligatory for any country."