A collapse of the Iran nuclear deal would be a "great loss", the UN atomic watchdog's chief warned US President Donald Trump on Monday, giving a wide-ranging defence of the accord and his agency's work under it.
Trump has threatened to withdraw the United States from the accord between Tehran and six world powers, signed in 2015 before he took office, unless Congress and European allies help "fix" it with a follow-up pact. Trump does not like the deal's limited duration, among other things.
Iran has stayed within the deal's restrictions since Trump took office but has fired diplomatic warning shots at Washington in recent weeks. It said on Monday that it could rapidly enrich uranium to a higher degree of purity if the deal collapsed.