Ahmadinejad's comments came one day after U.S. Secretary of State Hillary Clinton and Saudi Arabian Foreign Minister Saud al-Faisal expressed concern over Iran's nuclear program.Meeting in Riyadh with al-Faisal during a four-day trip to the Middle East, Clinton called Iran's recent announcement that it has started to produce higher-grade enriched uranium "a provocative move in defiance of United Nations Security Council resolutions" Clinton further warned that the "increasingly disturbing and destabilizing actions" by Iran "will result in increasing isolation".