The caption then changes to "Racist baby probably a Trump voter" before "What Actually Happened" appears on screen, with the video then showing the two toddlers running towards each other and embracing on the footpath.
"America is not the problem", the text at the end of the video reads. "If you see something, say something".
The post has been hit with a "Manipulated media" warning label by Twitter that takes users to a landing page with more information.
"This Tweet has been labeled per our synthetic and manipulated media policy to give people more context", a Twitter spokesperson said.
Mediaite described the video as from "a popular, right-wing meme account", but did not identify it.
‘No criminality’ to claim police were ‘poisoned’ at Shake Shack
William Maher, who was struck by an SUV and was hospitalized for several days, police said. The officers are all expected to recover from the alleged poison milkshakes.
Although Twitter had taken a largely hands-off approach to the president's controversial tweets, in recent weeks the company began adding a label that fact-checked misinformation amplified by the USA president, as well as a note cautioning that a post glorified violence. Trump tweeted about the protests against racial injustice, writing, "any difficulty and we will assume control but, when the looting starts, the shooting starts".
In a subsequent tweet, Twitter wrote "this tweet violates our policies regarding the glorification of violence based on the historical context of the last line, its connection to violence, and the risk it could inspire similar actions today".
The first time, the company added a fact-check to a Trump tweet that misstated how California was handling its mail-in voting.
However, the tech giant did remove campaign adverts by Mr Trump and vice president Mike Pence that featured an upside-down red triangle - a Nazis symbol used to designate political prisoners in concentration camps.