In an interview with Entertainment Weekly Clooney admitted that he got cold feet about the project.
"Paul and I talked about doing it, and we were sitting there one day and I was looking at him and I go, 'I can't do this movie, Paul,'" Clooney said. "He was like, 'Why?' I was like, 'Because everybody knows what you look like at 30 years old. You got blue eyes, I got brown eyes. You're too famous at 30 for me to be playing you at 30, it's never gonna work.' And he's like, 'I guess you're right.'"
"We bailed out," he added.
Unfortunately, Clooney and Newman never worked together on-screen before Newman died in 2008 at the age of 83.
Clooney can next be seen in the science-fiction film "The Midnight Sky," which he directed. It debuts on Netflix in December.