TEHRAN, Iran (AP) - Senior Iranian cleric Akbar Hashemi Rafsanjani is calling for the release of opposition supporters arrested in the government's crackdown on postelection protests. Rafsanjani has made the call during his sermon at Iran's main Friday prayers, where tens of thousands of opposition supporters have gathered in a show of strength for their movement. Rafsanjani is considered their top supporters in Iran's clerical leadership. Rafsanjani says keeping the detainees in prison "is not necessary," saying "we should not let enemies criticize or laugh at us ... for keeping our people in jail." The opposition is seeking to show their movement remains vibrant even after the crackdown following Iran's disputed June 12 presidential election.