Iran's stated policy on Israel is to urge a one-state solution through a countrywide referendum in which a government would be elected that all Palestinians and all Israelis would jointly vote for; which would normally be an end to the "Zionist state". Iran's supreme leader Ayatollah Khamenei, rejecting any attack on Israel, called for a referendum in Palestine. Ahmadinejad himself has also repeatedly called for such solution. Moreover, Khamenei's main advisor in foreign policy, Ali Akbar Velayati, said that Holocaust was a genocide and a historical reality. Mahmoud Ahmadinejad and other prominent officials have however on other occasion called for the destruction of Israel.