Donald Trump's son, 36, shared a video of Williams poking fun at Barack Obama’s former Vice President during a stand-up show in 2009.
Titled “Robin Williams Just Savages Joe Biden”, the clip sees the comedian quip: ”We still have great comedy out there, there’s always rambling Joe Biden, what the f***.
“Joe says s*** that even people with Tourette’s go, ‘No. What is going on?’”
Zelda, 31, was not impressed with Eric tweeting her father’s comments about Biden, who formally won the Democratic Party nomination to run for president opposite Trump in November’s US election.
In response, she fired back at him, writing: ”While we’re ‘reminiscing’ (to further your political agenda), you should look up what he said about your dad. I did. Promise you, it’s much more savage.”
Many Twitter users then began posting the video they believe Zelda was referring to.
In the clip taken from a New Jersey show in 2012, Williams described Trump as “a scary man” and “the Wizard of Oz” because “he plays monopoly with real f***ing buildings”.
He also criticised the future president for owning beauty pageants, for unsettling remarks he made about his daughter, Ivanka, as well as his hairstyle.
“The body is a maintenance system for the hair,” the comedian quipped at the show.
Williams died aged 63 in 2014.
Last month, Zelda paid tribute to her father on what would have been his 69th birthday.
“Today would’ve been Dad’s 69th birthday, so to honour him (& that glorious number), I will be donating $69.69 to as many local homeless shelters as I can,” she wrote.
“Join me if you like, but regardless, know I am wishing you all at least one hearty, immature belly laugh on dad today.”
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