What is a fatwa? Iran's Ayatollah has declared a fatwa against President Donald Trump and Israeli Prime Minister Netanyahu. Here's what it means.

Iran’s top Shiite cleric issued a religious decree called a fatwa on Sunday calling for violence against President Donald Trump and Israeli Prime Minister Benjamin Netanyahu, whose nations targeted Iran’s nuclear capabilities this month.

Trump said amid Israel's strikes that he knew where the Iranian leader was hiding and that he was an "easy target."