EVER since Donald Trump's election, he has had in his sights the "worst deal ever"-the one reached in 2015 that sought to circumscribe Iran's nuclear ambitions. For a while the threat to the survival of the agreement looked more rhetorical than real. No longer. On January 12th the president signed the waiver that prevents the reimposition of nuclear-related sanctions on Iran for a further 120 days. But, against the advice of his national-security team at the time, he warned that this would be the last such waiver unless the European parties to the deal-Britain, France and Germany-worked with America to fix what he regards as the fatal flaws in the agreement.
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