Iran's Supreme Leader Ayatollah Ali Khamenei said on Saturday that Tehran would not be bullied into negotiations, a day after Trump said he had sent a letter urging Iran to engage in talks on a new nuclear deal.

President Masoud Pezeshkian said Iran would not negotiate with the U.S. while being threatened, telling President Donald Trump to "do whatever the hell you want", Iranian state media reported on Tuesday.

Iran said Monday it would not negotiate under "intimidation", after US President Donald Trump sought to ratchet up pressure on Tehran by ending a sanctions waiver that had allowed Iraq to buy electricity from its Shiite neighbour. Iran's mission to the United Nations had indicated Sunday that Tehran might be open to talks aimed at addressing US concerns about the potential militarisation of its nuclear programme -- though not to ending the program completely. Here is the analysis of Saeed Azimi, France 24 correspondent in Tehran.