In surprise move, Iran's Ahmadinejad to run for president

Iran's former President Mahmoud Ahmadinejad on April 12 stunned the country by unexpectedly filing to run in the May presidential election, contradicting a recommendation from the supreme leader to stay out of the race.

Ahmadinejad's decision could upend an election many believed would be won by moderate President Hassan Rouhani, who negotiated the nuclear deal with world powers. Though Rouhani has yet to formally register, many viewed him as a shoe-in following Supreme Leader Ayatollah Ali Khamenei's recommendation in September last year for Ahmadinejad to stand down and conservatives' inability to coalesce around a single candidate.

Ahmadinejad's firebrand style could prove appealing for hard-liners seeking a tough-talking candidate who can stand up to U.S. President Donald Trump. His candidacy also could expose the fissures inside Iranian politics that linger since his contested 2009 re-election, which brought massive unrest.

Ahmadinejad previously served two four-year terms from 2005 to 2013. Under Iranian law, he became eligible to run again after four years out of office, but he remains a polarizing figure, even among fellow hard-liners.

 Two of his former vice presidents have been jailed for corruption since he left office. Iran's economy suffered under heavy international sanctions during his administration because of Western suspicions that Tehran was secretly pursuing nuclear weapons. Iran insists its nuclear program is for peaceful purposes.

Ahmadinejad's disputed re-election in 2009 sparked massive protests and a sweeping crackdown in which thousands of people were detained and dozens were killed.

Ahmadinejad described comments by the supreme leader suggesting he not run as "just advice" in a news...