The US special envoy for Iran, Rob Malley, had his security clearance suspended pending a review of allegations he may have mishandled classified information, said US officials. Mr Malley, who has been leading Biden administration’s efforts to revive the faltering Iran nuclear deal and resolve issues related to detained Americans in Iran, in the meantime is placed on unpaid leave, reported CNN. "I have been informed that my security clearance is under review. I have not been provided any further information, but I expect the investigation to be resolved favorably and soon,” he said confirming the reports in the local media. Two State Department officials said the agency’s Bureau of Diplomatic Security was leading the inquiry, which revolves around Mr Malley’s handling of classified documents. The officials said they learned of Mr Malley’s change in status from paid to unpaid leave on Thursday, shortly after questions about his status were raised at the State Department’s regular afternoon briefing. The officials spoke on the condition of anonymity. State Department spokesperson Matthew Miller said earlier Thursday that Mr Malley officially remains in his post but is on leave and that his deputy, Abram Paley, is currently leading the Iran portfolio as the acting special envoy. It remains unclear when Mr Malley’s leave began. Mr Malley’s whereabouts have raised questions since he skipped a classified congressional briefing on Iran on 16 May. At the time, State Department officials told lawmakers that Mr Malley was on "extended personal leave" and suggested that his absence might be related to a family health issue. A close personal friend of secretary of state Antony Blinken, Mr Malley was appointed soon after US president Joe Biden took office in 2021. He had been tasked with trying to revive the 2015 Iran nuclear deal after then-president Donald Trump’s 2018 decision to abandon the pact and reimpose US sanctions on Tehran. Under Mr Trump, Mr Malley worked for the International Crisis Group during which he met on several occasions with Iranians and Palestinian officials with whom US officials are barred from having contact. He helped craft the 2015 nuclear deal and, earlier in his career, was deeply engaged in former president Bill Clinton’s failed 2000 effort to broker Israeli-Palestinian peace. During the Obama administration, Mr Malley served as a National Security Council aide and was closely involved in the negotiations over the 2015 nuclear deal with Iran. Having failed to revive the deal, the United States has held talks with Iran to try to ease tensions by sketching out steps that could limit the Iranian nuclear program, release some detained US citizens and unfreeze some Iranian assets abroad, Iranian and Western officials said earlier this month. Additional reporting from the wires Read More In Iran, a restorer brings back to life famed Cadillac Sevilles once assembled in the country Iran supreme leader says he'd 'welcome' full diplomatic ties with Egypt; presidency websites hacked US, UK, France demand UN investigate Russia's sanctions-busting use of Iranian drones in Ukraine US sanctions Iranian firm for helping government censor internet Iran nuclear site deep underground challenges West as talks on reviving atomic deal have stalled