Iran Leadership Transition Begins After Death of Supreme Leader in U.S.–Israel Airstrikes

Clerics walk past a wall with a poster of Iran's Supreme Leader Ayatollah Ali Khamenei, after offering their condolences following his killing in Israeli and U.S. strikes, at the office of the Supreme Leader's representative in Najaf, Iraq, March 1, 2026.

The killing of Iran’s Supreme Leader, Ali Khamenei, 86, in U.S.–Israeli airstrikes has placed Tehran at a critical juncture, triggering a constitutional succession process and heightening regional tensions.

Several senior officials close to Khamenei were also reported killed in the strikes, including top security adviser Ali Shamkhani and Islamic Revolutionary Guard Corps commander-in-chief Mohammad Pakpour. Iranian authorities have vowed to respond, while U.S. President Donald Trump warned against retaliation and indicated that military operations could continue.

A woman wails and holds a poster as thousands of people gather in Enghelab Square for a pro-government demonstration after Iranian state media confirmed the death of Ayatollah Ali Khamenei on March 1, 2026, in Tehran, Iran.

The strikes occurred as Iranian diplomats were preparing for a new round of discussions reportedly aimed at addressing Iran’s nuclear program and easing tensions with Washington. The developments have intensified uncertainty over Iran’s political future and the broader trajectory of the Iran–Israel conflict.

Succession Process Under Iran’s Constitution

After more than three decades in power, Khamenei’s death leaves Iran’s clerical establishment responsible for overseeing only the second leadership transition since the 1979 Islamic Revolution.

Under Iran’s constitution, the next Supreme Leader is selected by the Assembly of Experts, an 88-member body of Shi’a clerics elected by the public every eight years. Candidates for the Assembly must first be vetted by the Guardian Council, a powerful oversight body whose members are partly appointed by the Supreme Leader.

Emergency personnel stand at the site of an Iranian missile strike on a residential building, after Iran launched missile barrages following attacks by the U.S. and Israel on Saturday, in Tel Aviv, Israel March 1, 2026.

When the office becomes vacant, the Assembly of Experts convenes to appoint a successor by majority vote.

According to constitutional requirements, the Supreme Leader must be a senior Islamic jurist with recognized expertise in Shi’a jurisprudence, along with demonstrated political judgment and administrative capability.

Interim Leadership Council

Article 111 of Iran’s constitution provides for a temporary leadership council to assume duties until a new Supreme Leader is appointed. Iranian media report that the interim body will include President Masoud Pezeshkian, Chief Justice Gholam-Hossein Mohseni-Ejei, and a cleric selected from the Guardian Council.

The council is expected to oversee state functions during the transition period.

Iran’s Supreme Leader Ali Khamenei

Senior Iranian official Ali Larijani said the succession process is underway. Analysts note that Iran’s political system has long anticipated the possibility of such a transition and has established institutional mechanisms designed to prevent a power vacuum.

Regional and Geopolitical Implications

The developments come amid escalating Middle East tensions, concerns over Iran’s nuclear program, and the risk of broader military confrontation involving U.S. and Israeli forces.

Luciano Zaccara, a research associate professor specializing in Gulf politics at Qatar University, said Iran’s leadership structure was designed to ensure continuity. He noted that institutional frameworks remain intact despite the loss of senior figures.

The coming weeks are expected to be critical for Iran’s political stability, regional alliances, and global energy markets as the country navigates its leadership transition.