Robertson said estimates of the boats ' nearest proximity to the warships range from 200 to 500 yards . NEW : Bush says Iran remains `` a threat to world peace '' and that the United States will not allow it to acquire nuclear weapons. National security adviser : Iranians `` are fishing in troubled waters here '' Pentagon video shows Iranian boats racing back and forth near U.S. Navy convoy .
NEW : Bush says Iran remains `` a threat to world peace '' and that the United States will not allow it to acquire nuclear weapons. National security adviser : Iranians `` are fishing in troubled waters here '' Pentagon video shows Iranian boats racing back and forth near U.S. Navy convoy .