 Two ultra-conservatives standing in Iran's presidential elections have withdrawn from the contest a day before polls open. Ali Reza Zakhani and Amir Hussain Ghazazadeh Hashemi called on other hardliners to agree on a single candidate. Their announcements are thought to be a response to concerns that the only reformist in the race, Massoud Pazeshki, is attracting a growing following among Iran's many disaffected voters.