The actor made the comments while presenting Meryl Streep with an award.
Robert De Niro attended the National Board of Review Awards in New York Tuesday night to present Meryl Streep with the Best Actress prize for The Post.
In the film helmed by Steven Spielberg, Streep plays legendary Washington Post publisher Katharine Graham, who tries to decide whether or not to post the Pentagon Papers in 1971.
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De Niro started his speech poking fun at Streep's co-star and fellow acting award winner Tom Hanks.
"[Streep] helps brings out the character of everyone else on the screen. Can a volleyball do that? Not even if the volley ball was a stable genius," he said, mocking President Trump's description of himself from Saturday.
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But then the Taxi Driver star went after Trump directly: "This fucking idiot is the president. It’s The Emperor’s New Clothes — the guy is a fucking fool."
"At the time of [The Post], Donald Trump was suffering from 'bone spurs,'" De Niro said. "Today the world is suffering from the real Donald Trump."
"Our government today, with the propping of our baby in chief— the jerkoff in chief I call him — has put the press under siege," he continued.
"The movie gave us glimpses of President Nixon as delusional, narcissistic, petty. Vindictive, nasty, and batshit fucking crazy. Ah, the good old days," he quipped.
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This is not the first time De Niro has attacked President Trump. Right before the 2016 election the actor said in a PSA that he'd like to punch Trump in the face.
LINK: Robert De Niro Calls Trump An "Idiot" And A "National Disaster"
via BuzzFeed/Travel