Former Iranian first vice president and reformist presidential candidate Mohammad-Reza Aref waves as he sits in his car after a campaign rally in Shahid Beheshti University in Tehran, on May 28, 2013. Aref Said Tuesday that he will defend Iran's nuclear right if he wins the presidential election on June 14. (Xinhua/Ahmad Halabisaz)

Former Iranian first vice president and reformist presidential candidate Mohammad-Reza Aref speaks during a campaign rally in Shahid Beheshti University in Tehran, on May 28, 2013. Aref Said Tuesday that he will defend Iran's nuclear right if he wins the presidential election on June 14. (Xinhua/Ahmad Halabisaz)

Former Iranian first vice president and reformist presidential candidate Mohammad-Reza Aref waves after a campaign rally in Shahid Beheshti University in Tehran, on May 28, 2013. Aref Said Tuesday that he will defend Iran's nuclear right if he wins the presidential election on June 14. (Xinhua/Ahmad Halabisaz)