Iran’s Supreme Leader Ayatollah Ali Khamenei delivers a speech during a ceremony marking the death anniversary of the founder of the Islamic Republic Ayatollah Ruhollah Khomeini, in Tehran, Iran, June 4, 2017. TIMA via REUTERS

As Iran prepares to mark the fortieth anniversary of the Islamic Revolution, the question of who will succeed the ill and aging supreme leader Ayatollah Ali Khamenei is resurfacing. No matter who that cleric might be, Iran is likely to be ruled by another religious figure who is far less powerful than Khamenei and more beholden to the Islamic Revolutionary Guard Corps (IRGC).

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