Donald Trump must be very busy these days – he hasn’t even taken the time to tweet a response to Robert De Niro, who yesterday called the GOP candidate “totally nuts.”

Speaking at the 22nd Sarajevo Film Festival, where he received the fest’s first lifetime achievement award, De Niro likened Trump to Travis “You talkin’ to me” Bickle, the demented anti-hero he played in Martin Scorsese’s 1976 Taxi Driver.

“What (Trump) has been saying is totally crazy, ridiculous, stuff that shouldn’t be even… he is totally nuts,” De Niro said. The actor’s comments, first reported by the AP, came during a Q&A. In addition to receiving the award, De Niro presented a restored version of the Scorsese classic.

“One of the things to me was just the irony at the end,” De Niro said about the moment in the film when Bickle “is back driving a cab, celebrated, which is kind of relevant in some way today too…People like Donald Trump who shouldn’t be where he is so… God help us.”