Barack Obama's memoir, A Promised Land has broken sales records by selling nearly 890,000 copies in the US and Canada in its first 24 hours.
It could possibly become the best-selling presidential memoir in modern history.
A Promised Land has been number one on Amazon.com and Barnes & Noble.com since Wednesday.
The only other book to come close to that number is Becoming by his wife Michelle Obama, which was released in 2018.
Her book sold 725,000 copies on the first day and to date has sold more than 10 million copies.