Cassidy Hutchinson’s book has been selling well due to the fact that it is written by an insider to the Trump administration, offering an unique perspective that can be hard to find elsewhere. Moreover, the book covers topics such as the inner workings of the White House, the president’s business relationships, and the political battles waged in Washington – all topics that are of major interest to many readers. Other books by other Trump insiders have also been selling extremely well, suggesting that many people are looking to get a better understanding of how the president operates and what is going on in his administration.