Answer: according to the chapter fourteen in the Islamic Constitution of Iran, it is impossible to change the content of those articles which concern the Islamic nature of the system and define the form of government.
These laws and regulations are originally on the bases of Islamic criteria and the faith and aims of the Islamic Republic of Iran.
The form of the government is republic while confiming the sovereignty of the command [of God] and religious leadership of the community [of believers].
Administration of such affairs are innetely with reliance on general referendums, and the official religion and ideology of Iran.