Iran needs to be careful. If they push us too far, it will be all-out war with the intent for regime change. The U.S. could probably destabilize their government and military sufficiently to create an Iranian civil war.
If war occurs, we will wipe out their command and control centers, their air force, their navy and target military bases and personnel for destruction. We can then also arm Iranian insurgents. It goes without saying that their nuclear facilities would also be targeted and eventually taken over by American special forces.
The Iranian regime overplayed their hand and got burnt. If they continue to push, it will be suicide for them.