Our country faces immense foreign policy challenges. None is more dangerous today than Iran. Iran seeks nuclear-weapons capability -- and the means to deliver those weapons. Most countries, other than the likes of Cuba and Venezuela, say no. Nuclear weapons in Iran's hands would be a global game-changer. Since 2003, various efforts to dissuade Iran from its nuclear ambitions have been tried. All failed. Now Washington wants tough new UN sanctions on Iran -- and soon. That's exactly right. Iran just