Because Biden is courting the Religion of Peace vote he probably won’t authorize any US action against Iran. It’s even possible Israel will be cut out of the intelligence loop making targeting more difficult.
The other nations where the US have bases have stated they will not allow the US to launch any actions against Iran from their soil. They want the US presence to protect THEM, not to be used as a geopolitical tool for US power. Any US actions would necessarily come from outside the region and would therefore be very expensive and riskier.
Responses from all players are likely to be asymmetric. Iran smacks Israel, Israel bombs an Iranian proxy. Iran is in an awkward position. They’ve used Israel as a stalking horse* to focus the anger of their populous outside of Iran. Now, they’ve put themselves right in the crosshairs of someone who could destroy them with the press of a button. I’ll bet there are few puckerd butts in Iran waiting to see what Israel does.
* A stalking horse is a term used in politics and idiomatic expressions: It refers to someone or something used to hide a true purpose.
I’m betting Bibi will respond with quiet, cold, precision. Iran’s mullahs and military strongmen suddenly die of…whatever.