Whatever Iran hit back with it will come back 2 fold.
So if iran want to hit back they should be aware that the USA will hit back harder.
I think Trump is just waiting for an excuse send in the troops.
Iran will have to be careful what they do next.
I assume that that attacking embassy's and killing americans is to go unpunished. Not anymore it seems.
If it had happened to the UK we would probably have taken some sort of action.