"Erratic conduct and behaviour," said Donald Trump, cost John Brennan his security clearance this week. The former director of the CIA would be excused a wry smile as he surrenders his accreditation to this most erratic of US presidents. Brennan is not the victim of a human rights violation. Clearance is a perk, not an entitlement, and enables its holders to profit through consultancy work for private firms. A man of his distinction will have other ways to earn a crust. His attacks on Trump, whose behaviour he has described as "nothing short of treasonous", might have been more measured, if only to keep the intelligence services out of an ugly political row. All the same, Trump’s sensitivity to criticism is undermining the integrity of his office. He has bullied the press, floated changes to the tax treatment of the National Football League and threatened a list of people beyond Brennan with the removal of their security credentials. The list’s inclusion of Bruce Ohr, a justice depa...

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