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.

As he considered military strikes against Iran, President Donald Trump publicly mused about killing the Islamic Republic's supreme leader, Ayatollah Ali Khamenei. Now, a senior Iranian cleric has made Trump a target.

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