**The former president of Iran, Mohammad Khatami, has called for a referendum on the legitimacy of the government, following June’s disputed elections.**Mr Khatami, quoted on Iranian websites, said millions of Iranians had lost faith in the electoral process.
The Iranian opposition, including Mr Khatami and the defeated presidential candidate Mir Hossein Mousavi, say the election was rigged.
Only the Supreme Leader, Ayatollah Ali Khamenei, can organise a referendum.
He has already declared the elections, won by the incumbent, President Mahmoud Ahmadinejad, as valid.
Thousands of opposition supporters took to the streets after the poll results were announced, to protest against what they saw as mass fraud.
At least 20 people are thought to have died during weeks of clashes.
The authorities banned all gatherings and the protests have died down in recent weeks.