Online retailing giant Amazon told senators on Thursday that it would no longer list a conservative book critiquing the "transgender moment" or any others "that frame LGBTQ+ identity as a mental illness."

The letter came amid an uproar over the company's decision to stop selling conservative author Ryan T. Anderson's book, "When Harry Became Sally: Responding to the Transgender Moment," which was published in 2018 and reached the top of the site's best-seller lists.

Sens. Marco Rubio, R-Fla., Josh Hawley, R-Mo., Mike Braun, R-Ind., and Mike Lee, R-Utah sent a letter to Amazon in February shortly after Anderson noted the removal of his book on the site.

"We carefully consider the content we make available in our stores, and we review our approach regularly," Amazon said, responding to a question from the senators about why the book had originally been allowed on the site. "As described above, we have chosen not to sell books that frame LGBTQ+ identity as a mental illness."