President Bush says the world will be in danger if Iran acquires nuclear weapons.
Mr. Bush repeated his concerns over Tehran's nuclear ambitions Saturday while visiting Pakistan. His comments come one day after talks between European and Iranian negotiators over the nuclear issue quickly broke down.
Western leaders want the International Atomic Energy Agency, AEA, which meets Monday in Vienna, to refer Iran to the United Nations Security Council for possible sanctions.
However, U.S. Secretary of State Condoleezza Rice says the Security Council is unlikely to use sanctions as a first response to the issue.
Washington accuses Tehran of secret efforts to develop an atomic weapon. Tehran, which resumed enriching uranium earlier this year despite Western protests, says its nuclear program is for generating electricity.
European negotiators called Friday's talks constructive, but said the Iranians did not show up ready to meet European demands it stop all uranium enrichment activities.
Iranian and Russian officials have been discussing a Russian proposal that would have Iranian nuclear fuel enriched on Russian soil. That proposal is designed to ease concerns that Iran could use enriched fuel to build a nuclear weapon. Iran says those talks will end if it is referred to the Security Council.
Some information for this report was provided by Reuters.