An “historic regret”. That, according to Iran’s President Hassan Rouhani, would be the consequence if America pulls out of the nuclear deal. But the Israeli President Benjamin Netanyahu deployed the exact same rhetoric used by Donald Trump – calling the 2015 agreement a “horrible deal”. It’s that kind of international intransigence Boris Johnson is attempting to overcome in a series of meetings in Washington this week. If he fails, the US president looks set to scrap the agreement by Saturday.