Robert De Niro thinks Donald Trump is 'totally nuts', and comparable to the mentally disturbed character the actor played in the legendary film Taxi Driver.

De Niro was participating in a question and answer session at the Sarajevo Film Festival on Saturday when the moderator asked him to discuss Travis Bickle.

The actor was nominated for an Academy Award for his portrayal of Bickle, a depressed veteran who becomes infatuated with a campaign worker and attempts to assassinate a presidential candidate.

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Robert De Niro thinks Donald Trump is 'totally nuts', and comparable to the mentally disturbed character the actor played in the legendary film Taxi Driver

De Niro was participating in a question and answer session at the Sarajevo Film Festival on Saturday when the moderator asked him to discuss Travis Bickle

But it wasn't the fictional Charles Palantine that De Niro compared Trump to - it was Bickle himself.

'What he has been saying is totally crazy, ridiculous, stuff,' De Niro said of the GOP presidential candidate.

'Stuff that shouldn't be even...he is totally nuts.'

De Niro also drew a comparison to how, at the end of Taxi Driver, Bickle is able to return to driving his cab after the failed assassination attempt.

'One of the things to me was just the irony at the end, he is back driving a cab, celebrated, which is kind of relevant in some way today too,' De Niro said.

De Niro was nominated for an Oscar for his portrayal of Bickle (pictured), who becomes infatuated with a campaign worker and tries to assassinate a presidential candidate

The actor also discussed the media, saying they had initially given Trump too much coverage at the start of his campaign - but were now starting to push back

'People like Donald Trump, who shouldn't be where he is so...God help us.'

De Niro's comments were met with frantic applause from the Sarajevans in the audience.

The actor also discussed the media, saying they had initially given Trump too much coverage at the start of his campaign - but were now starting to push back.

'Finally, they are starting to say, "Come on Donald, this is ridiculous, this is nuts, this is insane'".

De Niro opened the 22nd Sarajevo Film Festival, where he presented the restored version of Taxi Driver, which was directed by Martin Scorsese.