Four prominent Iranian politicians have joined hundreds of potential candidates who have applied to run in the June 14 presidential election.

The race will pick a successor to President Mahmoud Ahmadinejad, who is barred by the constitution from seeking a third term, and offer a critical test for reformists battered after years of crackdowns.

The four who submitted their candidacies on Friday are: liberal-leaning former vice president Mohammad Reza Aref; former Revolutionary Guard chief Mohsen Rezaei; lawmaker Ali Reza Zakani and Gholam Ali Haddad Adel, an ally of Tehran's mayor.

So far, 366 names are registered. Saturday is the final day for applications.

The hard-line Guardian Council, a constitutional watchdog, will vet the applicants before allowing them to run. The list of candidates will be announced later this month.