 Two main contenders to become Iranian president have registered to run in next month's election. They are hardline judiciary chief Ibrahim Raisi and former parliament speaker Ali Larry Jani. Raisi is a 60-year-old mid-ranking cleric in Iran's Sheikh Muslim establishment. Larry Jani on the other hand is a former nuclear negotiator and an advisor to Supreme leader Ali Khamenei. The June 18 election to succeed president Hassan Rouhani is seen as a test of the country's clerical rulers.