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You don't need to read beyond the introduction to get a sense of the delusion he has and if you flip through the book you'll see some claims that are preposterous. I read about his background and learned that he is given to the notion of a deep state and makes exaggerations. I do not regard this book as objective and authoritative.
The Deep Rig: How Election Fraud Cost Donald J. Trump the White House, By a Man Who Did Not Vote for Him (or what to Send Friends who Ask, "Why Do You Doubt the Integrity of Election 2020?")