It’s perfectly clear that Iran has violated the agreement in multiple respects, and that’s just what we can tell from publicly available information.
Tillerson State Department’s Certification of Iran’s Nuclear Deal Compliance ‘Embarrassing, Inexplicable, Patently False’
“…American national interests have to dominate what a president does – not abstract ideas about the way the world order should look, but concentrating on threats to America and dealing with them.”
The next step for the United States is the very serious consideration of military force.
North Korea is never going to voluntarily give up its nuclear weapons program. It is their ace in the hole. It is their insurance policy.
President Ronald Reagan listed Iran itself as a state sponsor of terrorism in 1984. In 2007, George W. Bush named the Quds Force, the tip of the IRGC spear internationally, terrorists as well. Without doubt, the IRGC qualifies.