John Cusack's Rush Limbaugh biopic has been given the green-light, according to Though the project is still in its early stages, Cusack will reportedly play the US conservative talk show host in a movie directed by Betty Thomas (Private Parts).

It is thought the film will focus on the radio host's three-decade rise to prominence. His syndicated show is now the highest rated in America, with a weekly audience of 15 million listeners. The as-yet-untitled biopic won't have a partisan take on the controversial host, despite Cusack's liberal convictions. "The script would explore the rise and reinvention of American talk radio, and Limbaugh's continued influence and impact over the last three decades in that world," said a spokesman for production company True Crimes Productions.

Limbaugh hit the headlines this summer after accusing Christopher Nolan's Batman movie The Dark Knight Rises of using Tom Hardy's Bane to damage Mitt Romney's run for the Presidency. According to The Guardian, he's previously raised eyebrows by proclaiming that African Americans are "left behind" socially because they have been trained to hate the U.S. He also insists that feminism was established so as to allow unattractive women easier access to mainstream society.

Director Thomas' has also previously worked on The Brady Bunch Movie in 1995, and Eddie Murphy's comedy vehicle Dr Dolittle.