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.

Iran has labeled Donald Trump as an "enemy of God" and called on Muslims to make him "regret his actions," sparking concerns about potential additional assassination attempts against the US President. The call to action was made in a religious edict known as a fatwa by Grand Ayatollah Naser Makarem Shirazi, Iran's leading religious cleric.