Earlier in the day, reporter Alex Berenson tweeted a picture of the email that Amazon’s Kindle Direct Publishing sent about the book, called “Unreported Truths about COVID-19 and Lockdowns.”
In the email, Kindle Direct Publishing said that the book, which specifically focused on death counts and estimates, “does not comply with our guidelines,” according to the tweet.
“As a result we are not offering your book for sale,” the email said.
Along with the picture, Berenson’s tweet said: “Oh f--- me. I can’t believe it. They censored it.”
Musk responded by directly tweeting to Amazon CEO Jeff Bezos.
“This is insane @JeffBezos,” he wrote.
In a second tweet, Musk added: “Time to break up Amazon. Monopolies are wrong!”
Later that day, Amazon responded to Berenson, saying it would publish his book.
Berenson tweeted: "Looks official - @amazon BACKED DOWN! Of course I don’t know what anyone who doesn’t have @elonmusk and so many others pushing will do, but at least this time they backed down."
In an interview with Fox News' Brian Flood, Berenson said he was grateful for Musk and others who defended him, including journalist Glenn Greenwald.
Amazon told Fox that refusing to publish Berenson's book was an "error," but Berenson wasn't so sure.
“They didn’t say to me that it was a mistake," Berenson told Fox. "I do believe that I’m not the only person who has run into this. They need to be clear what their position is on publishing controversial material on political issues."
However, on Thursday he appeared to be back. Among other tweets, Musk retweeted several posts about SpaceX, which launched its eighth Starlink mission on Wednesday night, according to the website.
SpaceX also successfully sent two NASA astronauts to the International Space Station on Saturday, May 30.