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, according to advance promotional materials exclusively obtained by Page Six.

The allegations from Byrne, a 29-year veteran of the military and federal law enforcement, threaten to derail her campaign days before she is expected to clinch the Democratic presidential nomination.

He describes Hillary Clinton as acting friendly one moment, then raging the next.

“What I saw in the 1990s sickened me,” he writes in the intro of the book, “Crisis of Character: A White House Secret Service Officer Discloses his Firsthand Experience with Hillary, Bill, and How They Operate.”

The book claims she repeatedly screamed obscenities at her husband, Secret Service personnel and White House staffers — all of whom lived in terror of her next tirade.

Secret Service agents had discussions about the possibility that they would have to protect Bill from his wife’s physical attacks, Byrne writes, and the couple had one “violent encounter” the morning of a key presidential address to the nation.

Meanwhile, a paranoid Hillary Clinton tried to have the Secret Service banned from the White House and once tried to ditch her security detail, Byrne says.

“Hillary Clinton is now poised to become the Democratic nominee for president of the United States, but she simply lacks the integrity and temperament to serve in the office,” he writes.

“From the bottom of my soul I know this to be true. And with Hillary’s latest rise, I realize that her own leadership style — volcanic, impulsive, enabled by sycophants, and disdainful of the rules set for everyone else — hasn’t changed a bit.”

The book isn’t set for release until June 28, but pre-orders have sent it to No. 1 on Amazon’s best-seller list.

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Source: Emily Smith, http://pagesix.com