An increasingly desperate Hillary Clinton is upping her attacks on Republican Donald Trump, but a new book reveals one of her latest accusations may end up boomeranging on her.

“Donald Trump is not qualified or temperamentally fit to be president of the United States,” Clinton told a crowd in California this week.

A new book by former Secret Service agent Gary J. Byrne and previewed exclusively on the Drudge Report Saturday evening, shows Hillary Clinton may actually be the “temperamentally unfit” candidate.

Chapter 1 of “Crisis of Character: A White House Secret Service officer discloses his firsthand experience with Hillary, Bill, and how they operate,” titled “The Vase,” reads in part:

Everyone on post that night, Secret Service agents (SAs), Secret Service Uniformed Division (UD) officers like myself, the houseman, and the ushers couldn’t help but hear the First Couple arguing as sounds from their fracases traveled through the old building. Mrs. Clinton had a booming voice, and their yelling matches easily traversed the living quarters’ private elevator, vents, and staircase. Many housemen eased away, but the SAs and UD couldn’t leave their posts. This was especially a big argument that ended with a crash. SAs were obligated to respond and found its cause, a vase on the other side of the room. A houseman picked up the damage. …

I peeked into the curator’s small, windowless ground-floor office across from the China Room and the Diplomatic Reception Room. It was cluttered with blueprints and history books on the every detail of the White House: fabrics, furniture, artifacts. Sure enough, there was a box containing a light blue vase smashed to bits. The rumors were true!

Byrne doesn’t explicitly accuse Hillary of untemperamentally throwing the vase. He doesn’t have to.

One of Bill Clinton’s former lovers, Sally Miller, recently revealed some of the secrets Bill told her during their three-month 1983 affair.

On the issue of Hillary’s temperament, Miller says, “I had heard that she threw plates and she threw items, a chair, and I asked Bill about that because that came out before I knew Bill and he said, yeah, she’s got a violent temper. He said she cusses like a sailor.

“And I don’t think we need that. We don’t need trash in the White House,” Miller tells The American Mirror.

Similar accusations have been reported elsewhere.

Last October, journalist Ed Klein wrote that Hillary had recently assaulted a “low level” campaign staffer.

“She has been pushing around and yelling and screaming at her campaign advisers,” Klein says. “In one case, a young woman, who’s very low level — more than an intern but not a major figure — didn’t do exactly what Hillary wanted. Hillary started screaming and yelling at her. The woman turned around the leave and Hillary went out and grabbed her arm and twisted her arm.

“This is the kind of behavior that they’re very concerned Hillary will demonstrate in public and really ruin her chances.”

Roger Stone says she has even turned her rage on Bill himself.

“Hillary Clinton has a long history of being domestically violent with Bill,” Stone writes in “The Clintons’ War On Women,” the New York Post reports. “Hillary has beaten Bill, hit him with hard objects, scratched and clawed him, and made him bleed.”

Byrnes’s “Crisis of Character” book will be released June 28th, according to its Amazon page. It shot to #1 Saturday night after the Drudge exclusive.