Backlash against Sacha Baron Cohen's new Ali G movie is mounting, with campaigners launching a petition to ban the film from cinemas.

A campaign has launched aimed at getting cinemas to refuse to screen 'Ali G: Who Iz I?,' which some argue contains racist and outdated stereotypes.

"I thought I'd play it safe and bring this guy back," wrote Cohen about the upcoming 'Ali G: Who Iz I?' movie, which is facing rising uproar.