* If a president dies in office, article 131 of the Islamic Republic's constitution says that the first vice president - who is Mohammad Mokhber - takes over, with the confirmation of the supreme leader, who has the final say in all matters of state in Iran.
* A council consisting of the first vice president, the speaker of parliament and the head of the judiciary must arrange an election for a new president within a maximum period of 50 days.
Raisi was elected president in 2021 and, under the usual timetable, a presidential election had been due to take place in 2025. Under constitutional rules, it can now be expected to take place by early July.
