In the open letter, the cast referenced a Change.org petition asking for Gunn to be reinstated. So far, the petition has attracted more than 330,000 signatures following Disney's firing of Gunn on July 20 after offensive tweets resurfaced in which the filmmaker joked about topics such as pedophilia and rape.

"We fully support James Gunn. We were all shocked by his abrupt firing last week and have intentionally waited these ten days to respond in order to think, pray, listen, and discuss," began the letter, signed by Pratt, Bradley Cooper, Zoe Saldana, Vin Diesel, Dave Bautista, Karen Gillan, Michael Rooker, Sean Gunn and Pom Klementieff. "In that time we have been encouraged by the outpouring of support from fans and members of the media who wish to see James reinstated as director of Volume 3, as well as discouraged by those who were so easily duped into believing the many outlandish conspiracy theories around him."

Gunn's offensive tweets were resurfaced by conservative personalities, and the Guardians stars referenced political division in the United States in the letter.

"There is little due process in the court of public opinion. James is likely not the last good person to be put on trial. Given the growing political divide in this country, it's safe to say instances like this will continue, although we hope American from across the political spectrum can ease up on the character assassinations and stop weaponizing mob mentality," the letter continued.

In announcing Gunn's firing on July 20, Walt Disney Studios chairman Alan Horn said, "The offensive attitudes and statements discovered on James' Twitter feed are indefensible and inconsistent with our studio's values, and we have severed our business relationship with him."

Though Disney and Marvel Studios had not set an official release date for Guardians of the Galaxy Vol. 3, the film had been preparing to shoot in Atlanta this fall, and Gunn had been working on a script. Gunn previously said the film would open in 2020. Gunn's two Guardians films have been big hits for Disney, with the 2014 original earning $773 million globally and last year's Guardians of the Galaxy Vol. 2 earning $863 million.

Before this letter, various castmembers had taken different approaches to publicly addressing Gunn's firing. Bautista, Rooker and the director's brother Sean Gunn had been the most outspoken in their support of the filmmaker, while Pratt had been more measured, sharing several Bible verses. This is the first statement on the subject from Cooper and Diesel.

Read the letter from the cast below.