"I watched him. and truly believe he may be "punch-drunk"," he said.
While De Niro's outburst received accolades from the anti-Trump #Resistance, it was the president's fans' turn to gloat after the twitter response. Without any preamble, he said, "I'm gonna say one thing".
De Niro prompted loud applause from the audience of theatre actors, directors and producers at Radio City Music Hall after he twice used the F-bomb against Mr Trump. "It's no longer down with Trump, it's f-- Trump!"
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Just wait until Robert De Niro plays the role of Mueller when the movie comes out about your crimes of treason and collusion.
De Niro has been an outspoken critic of Trump, even saying in May he barred the president from visiting any locations of his swanky restaurant, Nobu. However his message still received a standing ovation.
He famously said he wanted to punch Trump "in the face" during the 2016 US Election, called him a "f***ing fool" and the "baby-in-chief" in January 2018, and the following month said the US was now suffering from a "case of temporary insanity".
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Others recalled De Niro's famous remark from the movie.
Rather than dwell on the momentous occasion as North Korea and the US finally sat down and pursued a diplomatic means to avert the possibility of World War III, President Trump has taken a few minutes out of his busy schedule to have a pop at an actor that appeared in The Adventures of Rocky & Bullwinkle.
He said in Toronto: "I just want to make a note of apology for the idiotic behaviour of my president".
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