Promoting fire and fury: Iran will use your decision to stir up fire and fury against the United States and our interests in the region. Iran has proxy forces in countries including Iraq, Syria, Lebanon and Yemen, and Israel even said it was targeted by Iran from Syrian bases just last week. Israel pushed us to walk away from the deal (and has an ongoing standoff with Iran), so it may feel the brunt of an Iranian operational response to your decision. Pulling out of the deal can also be used as a way to inspire attacks against the United States and our allies because it feeds the narrative that the United States is evil and untrustworthy.
Source : https://www.cnn.com/2018/05/13/opinions/presidential-weekly-briefing-iran-fury-vinograd/index.html