Former President Donald Trump is planning to publish a book of letters he has written or received, according to a report from CNN.

The book will contain a selection of his correspondence with notable people he has known over his decades as a celebrity, including musicians Michael Jackson and Elton John, as well as the late British royal Princess Diana.

The publisher of the book is expected to be Winning Team Publishing, a press founded in 2021 by Donald Trump Jr. and Sergio Gor, a former Trump campaign aide. The press, which describes itself as “the nation’s premier conservative publishing house,” previously published former President Trump’s photo book, Our Journey Together, and Trump Jr.’s Liberal Privilege: Joe Biden and the Democrats’ Defense of the Indefensible.

Gor declined to comment to CNN about Trump’s book of letters, saying, “We don’t have anything to announce yet.”

Trump is the author of several previous books, including the The Art of the Deal, co-written with Tony Schwartz, who has claimed that he actually wrote the bestseller himself, and Crippled America, which Trump published the year before his 2016 election to the presidency.

As CNN notes, some Republicans who are considering running against Trump in the 2024 primaries also have books due next year, including Florida Sen. Marco Rubio and Florida Gov. Ron DeSantis, who is leading Trump in some polls.

Michael Schaub, a journalist and regular contributor to NPR, lives near Austin, Texas.