Comments by Iran's economy minister in reaction to US sanctions
I don't think Iran has a lot of fighting powder to hit back at the US but they probably have mitigating actions to help alleviate pressure from the latest sanctions. The real fear is if they feel emboldened enough to take more military action as what we saw last week when they shot down a US drone over the Strait of Hormuz.
Either way, tensions between the two are likely to escalate further before they get any better in the coming days/weeks.