What to know about Iran's Supreme Leader Ayatollah Ali Khamenei

President Donald Trump says Iran’s Supreme Leader Ayatollah Ali Khamenei has been killed in a major new attack by U.S. and Israeli forces, though there has been no official confirmation from Tehran. Khamenei was already under growing pressure long before his compound was among the first targets of Saturday's attack. The 86-year-old leader has no designated successor, and it's not clear what might happen in Iran if his death is confirmed. Tehran’s military power and influence across the Middle East have been weakened over the past two years, on top of long-running sanctions and economic troubles.