Will Ali Khamenei's Death Trigger Radicalism from His Successor in Tehran?

The death of Ayatollah Ali Khamenei on 28 February 2026 has created the most critical power vacuum in modern Iranian history. As the supreme authority commanding the military, judiciary, and foreign policy, the profile of his successor will determine whether the Middle East descends into deeper conflict or finds a new balance of power.

According to Article 111 of Iran’s Constitution, power is currently exercised by a temporary council comprising President Masoud Pezeshkian, Chief Justice Gholamhossein Mohseni Ejei, and senior cleric Alireza Arafi. This council is tasked with maintaining stability until the Assembly of Experts selects a permanent leader.

Khamenei’s second son is known to have extremely close ties with the Islamic Revolutionary Guards Corps (IRGC). Concerns about radicalism are frequently directed at him because he is seen as representing the interests of the military faction that wants Iran to remain on a confrontational course towards the West. However, his greatest challenge is the stigma of “hereditary leadership”, which has been deeply resented since the 1979 Revolution.

Arafi represents the traditional clerical faction loyal to state ideology but more politically measured. As head of the seminary in Qom, he possesses stronger religious legitimacy than Mojtaba, making him a “safe” candidate for senior clerics.

There is a perception that a new leader will employ radical rhetoric to consolidate power in the early stages of their tenure. In situations of war or external pressure, displaying a compromising stance could be viewed as weakness by hardline factions domestically. Therefore, after 2026, Iran may appear more rhetorically aggressive as a form of self-defence and survival strategy.

Although ideology remains paramount, Iran’s new leader cannot ignore economic realities. Fluctuations in oil prices due to tensions in the Strait of Hormuz will pressure Iran’s own economy. If the new leader becomes so radical that they trigger heavier sanctions, they risk facing domestic rebellion from Iran’s increasingly vocal younger generation demanding change.