Apparently you are unaware that the JCPOA wouldn't stop Iran from developing a nuclear weapon. There is a reason Democrats never even tried to convert it into a treaty. It wouldn't have stood the light of that level of analysis.
If Iran were honorable and trustworthy (what do YOU think about that?), it would have, at best, delayed their nuclear weapons program...until about now.
Democrats (Clinton with N.Korea & Obama with Iran) reversed the US policy of non-proliferation.