President Trump has called it the worst deal in U.S. history, but the decision to keep it intact has repercussions for more than a half dozen countries and the European Union. FOX News spoke to Dr. Walid Phares, National Security and Foreign Affairs expert and served as President Donald Trump's Foreign Policy adviser during the 2016 campaign, about the deal and the options of this administration.

Listen to the interview below:

Dr. Walid Phares, Author of "The Lost Spring: US Policy in the Middle East and Catastrophes to Avoid". Follow Him on Twitter: @WalidPhares