Long, fraught time line of tensions over Iran's nuclear program ahead of its presidential election

Iran will elect a new president Friday after the death of hardline President Ebrahim Raisi. Whoever takes the helm in the country will inherit Iran’s rapidly advancing nuclear program, which now enriches uranium closer than ever to weapons-grade levels. Iran’s atomic program first came to the country under American aspirations of peaceful energy, but it later drew Western fears over the Islamic Republic’s possible development of nuclear weapons.