Crisis of Character: A White House Secret Service Officer Discloses His Firsthand Experience with Hillary, Bill, and How They Operate is a best-selling 2016 book by former United States Secret Service Uniformed Division officer Gary J. Byrne with Grant M. Schmidt that purports to describe President Bill Clinton and First Lady Hillary Rodham Clinton as they resided in the White House during portions of the 1993–2001 Clinton administration, alleging marital infidelities on his part and an imperious manner on hers.

[2] Former members of the Secret Service suspect that Byrne was, as paraphrased by a reporter, "working from office rumors that he's cinematically written himself into".

[1] Media Matters wrote that in places Byrnes' account in the book stood in contradiction to his sworn testimony before the Independent Counsel during the Lewinsky scandal in 1998.

[4] An opposite stance was taken by the author, party of interest Donald Trump, and some in the conservative commentariat, who said that the mainstream media was deliberately ignoring the book.

[1] Soon after publication, the book debuted atop the New York Times Non-Fiction best seller list,[9] and stayed on top during its second through fifth weeks.