"Iran has several options if the United States leaves the nuclear deal. Tehran's reaction to America's withdrawal of the deal will be unpleasant," TV quoted Iranian Foreign Minister Mohammad Javad Zarif as saying on his arrival in New York.
Under Iran's settlement with the United States, France, Germany, Britain, Russia and China, Tehran agreed to curb its nuclear program to satisfy the powers that it could not be used to develop atomic bombs. In exchange, Iran received relief from sanctions, most of which were lifted in January 2016.
Iran has said it will stick to the accord as long as the other parties respect it, but will "shred" the deal if Washington pulls out.