Manning, previously known as Bradley Manning, was an Army private who was convicted in 2013 and is serving a 35-year term for leaking national security materials to WikiLeaks. She will write "occasionally from Fort Leavenworth prison on the subjects of war, gender, and freedom of information" for the British newspaper's American site, Viner wrote in a staff memo. Manning will not be paid.

Manning wrote an essay for The Guardian in December about being a transgender woman. Manning began transitioning to a woman while in custody last year.

Viner also announced on Tuesday that The Daily Beast's Ben Jacobs and The Huffington Post's Sabrina Siddiqui are joining the site as political reporters.