premise: The move is set to further inflame tensions over the Iranian nuclear programme, which the Islamic republic has vowed to expand in defiance of the sanctions agreed by the UN Security Council last week.
  Iran has refused to heed the council's demand to suspend uranium enrichment, a process that Western countries fear could be used to develop a nuclear weapon. Iran insists its atomic drive is entirely peaceful.
  The formulation of the bill gives the government a free hand to limit cooperation with the Vienna-based IAEA. This could involve limiting UN inspections of its atomic sites, a move urged by several lawmakers.
   Why does the UN Security Council demand that Iran stop uranium enrichment?
hypothesis: Western countries fear could be used to develop a nuclear weapon