LyrArc Article Gist
Bret Stephens in the NYT points out that the Iran Nuclear Deal did not have the support it needed to become a lasting agreement. He cites a Pew poll at the time of the deal showing 21% supporting it and 49% not supporting it. It lacked the two thirds support needed in Congress for a treaty to be passed. It was a J.C.P.O.A. or Joint Comprehensive Plan of Action not an Executive Agreement or a Treaty, says Stephens.

France initially called for stronger safeguards so that the Agreement would limit the development of nuclear weapons. Only later did France and the EU come into acceptance of the deal. 

Stephens points out the efforts to renegotiate the deal coming from the EU, and cites this as showing that a better deal could have been negotiated. Since the deal the conflicts in the Middle East have continued to grow, so that the constructive developments of advancing Iran's economic development and reducing the role of military conflicts were not addressed, say experts skeptical of the deal.