Liars should never write books. Books are a real problem. Because liars always have to be ready to change their stories, and once a book is released, there's no changing it. The book says what it says, and it's out there for people to read. If you now want to say something different, how do you deal with the fact that your own book is floating around contradicting you?
But Hillary Clinton has to change her story because that's what she does, so the fact that she wrote a book in 2014 bragging about getting other nations to support the Trans-Pacific Partnership cannot stop her from pretending it never happened - a must now that she has changed her position from calling TPP the "gold standard" of trade agreements to opposing it entirely.