Iranian Supreme Leader Ali Khamenei is the Middle East's longest-serving autocrat, consolidating near-absolute control in his roughly 37-year reign.Why it matters: President Trump opted for military strikes in Iran after failing to reach a nuclear deal with Tehran, raising the risk that the administration will push for regime change. The first strike landed near Khamenei's office, per AP.Here's what to know about Iran's supreme leader:How long has Khamenei been in power?Khamenei has wielded infl...