Candidates have begun registering for Iran's presidential election due to be held on May 19.
President Hassan Rouhani is expected to seek re-election.
Rouhani is a moderate who engineered Iran's 2015 nuclear deal with world powers that secured a removal of international financial and trade sanctions against Tehran.
Rouhani won election by a landslide in 2013 on a platform of ending the Islamic Republic's international isolation.
However, he faces a stiff challenge from hardline conservati
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