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President Donald Trump's decision to dump the nuclear deal with Iran has presented the Tehran government with a choice. Does it make a concerted effort to keep the agreement intact along with the other signatories, or does it ramp up its nuclear programme and hang the consequences? Stephen Sackur speaks to a former spokesman for Iran's nuclear negotiations team- Seyed Hossein Mousavian. In the face of intense pressure from the US, Israel and Saudi Arabia how will Iran respond?