Hillary Clinton has a “Jekyll and Hyde” personality that left White House staffers scared stiff of her explosive — and even physical — outbursts, an ex-Secret Service officer claims in a scathing new tell-all. Gary Byrne, who was posted outside the Oval Office when Bill Clinton was president, portrays Hillary as too “erratic, uncontrollable and occasionally violent” to become leader of the free world He describes Hillary Clinton as acting friendly one moment, then raging the next.