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A former Secret Service officer claims that Hillary Clinton displayed a "volcanic" temper as First Lady, once leaving the president with a "black eye" during a loud fight. 

Gary J. Byrne's Crisis of Character describes Mrs. Clinton as being “volcanic, impulsive, enabled by sycophants, and disdainful of the rules set for everyone else.”

Byrne says he was "posted directly outside President Clinton’s Oval Office" and says the book, which will be released June 28, shows the Clintons in a whole new light.

Byrne wrote of an alleged 1995 fight between the President and First Lady that was overheard by multiple agents and left the commander-in-chief with a "black eye."

"This was a shiner, a real, live, put-a-steak-on-it black eye. I was shocked," writes Byrne, arguing that Clinton "lacks the integrity and temperament to serve in the office."

Byrne recalled agents discussing the possibility of having to protect the president from his own wife.

This book will reveal that the biggest scandals with the Clintons aren't related to infidelities, but the fact that they believe they can live by a different set of rules than everyone else, Matt Schlapp said on "America's Newsroom" today.

"It's how they roll, and the American people should know it," Schlapp said.

Mary Anne Marsh argued that this book is another example of how the 2016 campaign is going "straight to the gutter."

She said that Donald Trump is hoping for that kind of negative campaign because it will keep many Americans from voting, which could favor the presumptive Republican nominee.

Watch more above.

UPDATE: The Clinton campaign responded this afternoon by accusing Byrne of trying to "cash in" on the election cycle, slamming the book as "nonsense" that should be in the "fantasy section" of book stores.

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