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The US President announced that he thought Iran was breaching the spirit of the 2015 agreement and demanded tougher restrictions.
He tasked Congress with agreeing a series of new “trigger points” which if crossed would lead to the re-imposition of sanctions.
Mr Trump fell short of scrapping the deal in its entirety - a campaign pledge - but made clear he was willing to walk away if no improvements are made.
The decision sparked an immediate backlash from world leaders who have been intensely lobbying Mr Trump to commit to the deal.