Hollywood legend Robert De Niro launched into an attack on US president Donald Trump during a live broadcast of the Tony Awards on Sunday.

"I'm gonna say one thing. Fuck Trump!” the Oscar-winning actor announced as he appeared on stage to introduce Bruce Springsteen, lifting his fists to the air as the crowd gave him a standing ovation.

As the applause continued at New York’s Radio City Music Hall, De Niro continued: "It's no longer down with Trump. It's fuck Trump."

US TV network CBS managed to bleep over the expletive before it reached American screens, but you can watch the uncensored Australian broadcast below:

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De Niro went on to introduce Springsteen by praising his politics, saying: "Bruce, you can rock the house like nobody else and even more importantly in these perilous times, you rock the vote, always fighting for, in your own words, truth, transparency and integrity in government. Boy, do we need that now."

Around six million viewers watched the show last year. The White House has so far refused to comment.

De Niro has long been virulently anti-Trump. In a video released a month before the 2016 election, he called the former reality show star “stupid” and said, “I’d like to punch him in the face.”