Trump took to Twitter to blast Trudeau, calling him "very dishonest and weak" shortly after leaving the summit early aboard Air Force One.
His economic adviser then went on CNN to say that Trudeau had "stabbed Trump in the back" with his comments on tariffs.
A CBS spokesperson said in a statement to Deadline: "Mr. De Niro's comments were unscripted and unexpected". While CBS was quick to catch the swear for US audiences, the word wasn't censored during the Australian broadcast.
"It's no longer down with Trump".
"Canada's foreign affairs minister, Chrystia Freeland, responded to the attacks by saying the country "does not believe that ad hominem attacks are a particularly appropriate or useful way to conduct our relations with other countries".
In 2016, when Trump was the Republican presidential candidate, De Niro slammed him as "blatantly stupid", "totally nuts", and an "idiot". "Boy, do we need that now". De Niro said he'd be happy to accept.
Kushner denounced Trump's presidency as "the Hitler mistake" that let a "borderline psychotic narcissist in the White House".
Robert De Niro seemed to be sending a message on behalf of Broadway.