Iran Supreme Leader Delivers Rare Sermon, Defends Military Force

Khamenei delivered a rare public sermon, his first in eight years, defending Iran's military actions against the US, including recent missile strikes on US bases in Iraq. He claimed divine support for the attacks and criticized the US for the killing of Iran's top military leader. Khamenei also expressed condolences for the victims of the accidental downing of a Ukrainian airliner. Historically, Khamenei has appointed temporary clerics to deliver sermons since becoming the supreme leader.

How long has the Committee been delivering sermons before Khamenei became the supreme leader?

What role did temporary clerics play in Khamenei's sermons since he became the supreme leader?