Many reviewers at Cannes have surmised that the movie takes a critical view of Obama's administration, and shows his reign as US president as being one of empty promises.
"Only part of that is true. The movie sets Obama's 2008 Democratic National Convention speech against a landscape of greed and violence but this wasn't an attempt to criticize Obama, but rather the footage was used as a real expression of hope," Pitt said.
The film's director, Andrew Dominick, said that the gangster movie was critical of capitalism, rather than the US government specifically.
"I always feel that crime films are about capitalism, because it is a genre where it is perfectly acceptable for all the characters to be motivated by a desire for money. In some ways, the crime film is the most honest American film because it portrays Americans as I experience a lot of them, in Hollywood, as being very concerned with money," Dominick said.
Photos: Katrina Kaif, Shamita Shetty at Mumbai airport
Photos: Varun Dhawan, Alia Bhatt promote 'Badri...' on 'Dil Hai Hindustani'
In pictures: 15 facts about kissing that will surprise you
Photos: Shahid Kapoor and Mira Rajput at cafe in Bandra
Photos: Deepika Padukone, Neha Dhupia and Soha Ali Khan at event