Anderson said that Amazon "acknowledged that they did not contact us ahead of time, in violation of their own policy to first contact authors and publishers."
He warned about the precedent that the de-listing could send. "This means that anyone who's telling the truth that we're created male and female, whether from a faith-based perspective or from a science-based perspective, can be banned on a whim and without explanation," Anderson said.
Earlier this week, four Republican senators--Marco Rubio of Florida, Mike Lee of Utah, Mike Braun of Indiana, and Josh Hawley of Missouri--sent a letter to Amazon CEO Jeff Bezos inquiring about the company's removal of Anderson's book.
The senators wrote that Amazon has not provided "a sufficient explanation as to how Anderson's book, which reached the top of two of Amazon's best-seller lists before it was even released in 2018, supposedly violated a vague, undefined 'offensive content' standard."
"When Harry Became Sally prompted important discussions in the national media and among policymakers in 2018, and remains one of the most rigorously researched and compassionately argued books on this subject," the senators wrote.
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"By removing this book from its marketplaces and services, Amazon has unabashedly wielded its outsized market share to silence an important voice merely for the crime of violating woke groupthink," they stated.
While Anderson's book remains unavailable for purchase on Amazon, an ebook called "Let Harry Become Sally: Responding to the Anti-Transgender Moment" remains available on the retail giant's website. The product description says some of the book's proceeds will be donated to the National Center for Transgender Equality.
Anderson said that "When Harry Became Sally" may be purchased directly from its publisher, Encounter Books, "as well as from Barnes and Noble, where it is currently the #2 selling book in America."