TEHRAN, Iran — A conservative Iranian legislator warned Saturday that his country may pull out of the Nuclear Nonproliferation Treaty after a U.N. resolution censuring Tehran – a move that could seriously undermine world attempts to prevent Iran from developing atomic weapons. Iran's official news agency quoted a hardline political analyst who made the same point, another indication the idea could be gaining steam. If Iran withdraws from the treaty, its nuclear program would no longer be subject to oversight by the U.N.