Donald Trump is undeniably a skilled salesman—his powers of persuasion are a big part of how he got to the White House. Yet despite being a bestselling author himself, the president is not much of a bookseller. Friday morning, the writer Nick Adams received what you might expect to be pretty much the greatest endorsement ever: On Twitter, Donald Trump called his book Green Card Warrior a must-read.
Yet a little after 10 am eastern time, some three hours after Trump tweeted his critical praise, Adams’ book remains mired at almost #19,000 on the Amazon sales list.

Adams is faring even worse at Barnes & Noble’s website, where his book is not even in the top 100,000.
Trump is great at selling himself. It remains to be seen whether he can sell other things—be they policies or other people’s books.