US actor and producer Robert De Niro has said Republican presidential candidate Donald Trump should not run for president because he is "totally nuts". De Niro made the comments at a film festival in Sarajevo, where he was collecting a life time achievement award. Presenting a digital version of the film "Taxi Driver", in which he starred 40 years ago, the famous actor said: “I don't know, it's crazy that people like Donald Trump...he shouldn't even be where he is, so God help us." The 73-year-old's comments were met with wide applause by the audience in the Sarajevo National Theater.