Biden has vowed not to let Iran develop a nuclear weapon on his watch, but it remains unclear what steps Iran would have to take in order for the Biden administration to respond with direct hits, given that Tehran has already been reported to have stockpiled near-weapons-grade uranium and to be bolstering its weaponization capabilities.

White House national security adviser Jake Sullivan presented President Biden with options for a potential U.S. attack on Iran's nuclear facilities if the Iranians move towards a nuclear weapon before Jan.

Israel has released details on its daring September commando operation in Syria in a message to Tehran that it is willing and able to do the same in Iran, with or without US participation.