President George W. Bush said on Friday a Nuclear-armed Iran posed a "grave threat" and insisted it was "logical" that the regime be dealt with by the United Nations Security Council. Presenting a united front with German Chancellor Angela Merkel at the White House, Mr Bush said he was not going to prejudge what the Security Council should do, but added, "I recognise that it's logical that a country which has rejected diplomatic entreaties be sent to the United Nations Security Council."