In her new memoir, "Melania," Melania Trump writes about her marriage to Donald Trump, where she was on January 6, and that infamous jacket.

Depending on how you define “memoir” — must it be a coherent narrative, or does a posthumous collection of diary entries suffice? — roughly a dozen first ladies of the United States have penned a total of more than 20 accounts of White House life ( Hillary Clinton, who simply will not be stopped, is responsible for four on her own).