Iran said on Saturday it would retaliate against sanctions imposed on its judiciary chief by Washington as US President Donald Trump decided to extend Tehran's sanctions relief for four months as part of the 2015 nuclear deal. Trump said on Friday he would waive nuclear sanctions against Iran for the last time to give Washington and its European allies a chance to fix the "terrible flaws" of the agreement, Reuters reported. Washington also announced sanctions against 14 entities and people, including the head of Iran's judiciary, Ayatollah Sadeq Amoli Larijani. "The Trump regime's hostile action ... crossed all red lines of conduct in the international community and is a violation of international law and will surely be answered by a serious reaction of the Islamic Republic," Iran's Foreign Ministry said in a statement. On Friday, Iran's Foreign Minister Mohammad Javad Zarif said on Twitter that Trump's decision was an attempt to undermine the multilateral agreement.