Iran has said that it will retaliate against the sanctions imposed by the United States on the head of its judiciary, Ayatollah Sadeq Amoli-Larijani.
Iran also refused to accept any changes to its 2015 nuclear deal with the world powers.
On Friday, U.S. President Donald Trump, a critic of the 2015 accord to prevent Iran developing nuclear arms, said that he would extend sanctions relief one last time to give Washington and its European allies a chance to fix the "terrible flaws".
However, the U.S. imposed fresh sanctions on 14 individuals and entities over alleged human rights abuses.
Iran's Foreign Ministry said in a statement carried by state media, "The Trump regime's hostile action (against Larijani) 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 Minister Mohammad Javad Zarif had earlier said on Twitter that Trump's decision undermined the multilateral agreement.
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