Eric Trump quickly to his followers, along with a caption that read: "Robin Williams Just Savages ."
The clip was taken from Williams' 2009 HBO special, Weapons of Self Destruction.
In the clip, Robin called the former VP "rambling Joe Biden" and added that "Joe is like your uncle who is on a new drug and hasn't got the dosage right."
Following the president's son tweet, the clip has gained even more traction on social media.
Robin's daughter Zelda Williams, 31, was one of the many who saw the clip -- and .
"While we’re ‘reminiscing’ (to further your political agenda), you should look up what he said about your Dad," she wrote in response to Trump.
The tweet continued: "I did. Promise you, it’s much more ‘savage.'
"Gentle reminder that the dead can’t vote, but the living can ♥️."
On Zelda's Twitter thread, many commented on the exchange.
"I am SO sorry your dad has been used like this in for political gain. I am fuming at seeing this," one Twitter user said.
One person shared a clip from the same 2012 comedy show where Robin took a jab at pre-politics , saying that Trump "plays Monopoly with real f---ing buildings."
Robin recalled spending a Thanksgiving in Atlantic City where "Donald Trump is the Wizard of Oz."
Robin said: "This is a scary man and he owns all of these beauty pageants… Isn't that like Michael Vick owning a series of pet stores?"
"This is a man who said, 'My daughter is hot.'"
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The Twitter spat came just days before the anniversary of Williams' tragic death.
Robin died on August 11, 2014 at the age of 63 by suicide.
His death came after he was suffering from Lewy Body Dementia, a type of brain disease that affected his thinking, memory and movement control.