This isn't the first time De Niro has gone after Trump.
The actor was bleeped when he used the F-word. "I watched him last night and truly believe he may be 'punch-drunk, '" the leader of the free world tweeted. The Academy Award victor shouted out, "Fuck Trump!", a declaration which brought the audience to their feet in ovation.
With the audience of theater actors, directors and producers shrieking and rising to their feet in applause, De Niro said: "It's no longer down with Trump".
Of course, De Niro has made no secret of his hatred for Trump - he previously said "Trump's so blatantly stupid".
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A day later, De Niro apologized - not to Trump but on America's behalf to Justin Trudeau, whom Trump insulted as "very dishonest & weak" after the Canadian prime minister threw shade on the president's trade policies.
Ahead of the 2016 presidential election, De Niro said he'd like to "punch [Trump] in the face".
Granted, we don't want that remark to sound too disparaging towards De Niro because we all know that he's an acting icon.
In fairness De Niro was pretty aggressive on the Tony stage, taking time away from the biggest awards show for Broadway with his curt, but pointed attack at the president. On Tuesday, De Niro apologized for "the idiotic behavior of my president" in a speech at the groundbreaking of a restaurant in Toronto, CNN reported.