Prime ministership of Mir-Hossein Mousavi secret negotiations and dealing with USA on helping them free the American hostages in Lebanon, in return for sale of the American weapons and spare-parts that Iran's army badly needed for Iran–Iraq War. Shortly after the end of Iran–Iraq War on 20 August 1988, Ruhollah Khomeini died, and Ali Khamenei was elected as the new Supreme Leader by the Assembly of Experts. Following his death, Mousavi and his fellow left-wingers lost their main source of support within the establishment. During the parliament hearing on post-war reconstruction plans, Mousavi had heated arguments with Ali Akbar Hashemi Rafsanjani, the speaker of Iran's
Mir-Hossein Mousavi ensure that Iranian women are treated equally, with the ability to attain financial empowerment and to serve at the highest levels of decision making bodies. Mousavi directly addressed activating foreign policy to boost national interest by reducing tensions with other nations. This included negotiating with U.S. President Barack Obama if "his actions are in keeping with his words". He condemned Ahmadinejad's attitude toward The Holocaust (namely, that it was "a myth"), and condemned the killing of Jews in the Holocaust. The election was held on 12 June 2009. The official results showed Ahmadinejad winning by a landslide, though Mousavi and