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The surest sign yet that the Iranian nuclear deal is in deep trouble is its endorsement by Israel’s prime minister, Benjamin Netanyahu.

“A positive first step,” Mr Netanyahu called the deal. This was in marked contrast to his own defence minister, Ehud Barak, who complained earlier that the agreement accorded Iran “legitimisation for enriching uranium for civilian purposes on its soil, contrary to the understanding that those negotiating with it have about its real plans”.

Mr Barak and Mr Netanyahu march in lockstep when it comes to Iran. The reason for their apparent disagreement is simple. Mr Barak dismissed the proposed deal when it looked as if Iran might accept it. Mr Netanyahu’s approval came only after Iran’s response was interpreted by the...