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British Foreign Secretary Philip Hammond, U.S. Secretary of State John Kerry, EU's foreign policy chief Federica Mogherini and Iranian Foreign Minister Mohammad Javad Zarif arrive prior to the announcement of an agreement on Iran nuclear talks on April 2, 2015 at the The Swiss Federal Institutes of Technology in Lausanne
British Foreign Secretary Philip Hammond, U.S. Secretary of State John Kerry, EU's foreign policy chief Federica Mogherini and Iranian Foreign Minister Mohammad Javad Zarif arrive prior to the announcement of an agreement on Iran nuclear talks on April 2, 2015 at the The Swiss Federal Institutes of Technology in Lausanne

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CNN's Hala Gorani speaks to former Pentagon adviser Michael Rubin about the newly announced nuclear deal struck with Iran.

Expert: Having a deal may not be all it's made out to be

CNN's Hala Gorani speaks to former Pentagon adviser Michael Rubin about the newly announced nuclear deal struck with Iran.