NEW YORK — Bill O’Reilly’s next subject in his million-selling “Killing” series isn’t just one person but a whole country: Japan.

O’Reilly’s “Killing the Rising Sun” focuses on the final year of World War II. It’s coming out Sept. 13.

O’Reilly told The Associated Press during a recent interview he and co-author Martin Dugard have researched the conflict from the American and Japanese sides.

O’Reilly says the book also will include letters from former Presidents Jimmy Carter, George H.W. Bush and George W. Bush on whether they would have ordered the atomic bomb attacks.

Publisher Henry Holt and Co. told the AP on Wednesday more than 14 million copies of O’Reilly’s series are in print worldwide. The series includes “Killing Jesus” and “Killing Patton.”