Former Iranian Prime Minister Mirhossein Moussavi waves to journalists after speaking at a news conference in Tehran, April 6, 2009. Iranian President Mahmoud Ahmadinejad's main moderate challenger at the June presidential vote said on Monday he would adopt a conciliatory foreign policy towards the West unlike his "extremist" opponent. Prime minister during Iran's 1980-88 war with Iraq, Mirhossein Mousavi, 67, is seriously considered by many moderates and even some conservatives as their main presidential candidate and a strong rival to Ahmadinejad in the contest. REUTERS/Morteza Nikoubazl (IRAN POLITICS ELECTIONS HEADSHOT)