The Trump campaign has deleted a video posted to the former president’s Truth Social account, which referenced a “unified Reich”.
The 30-second clip outlined a vision of the US under Mr Trump through stylised headlines, one of which used a term now often associated with Nazi Germany.
It appeared on Mr Trump’s account on Monday and was deleted the next day.
A spokeswoman said it was not an official campaign video and was posted by a junior staff member, not Mr Trump.
The video starts with text heralding a “TRUMP LANDSLIDE” along with a voiceover saying “What happens if Donald Trump wins?”
It then scrolls past a headline which reads: “Industrial strength and production had significantly increased after 1871, driven by the creation of a unified Reich”.
Germany was unified in that year as a Reich, or empire, more than half a century before the Nazi Party rose to power and declared the Third Reich under Adolf Hitler.
In later images in the video, headlines including “Border Is Closed” and “15 Million Illegal Aliens Deported” appear, alongside a picture of a portion of the wall on the US southern boarder and – incongruously – the dates of World War One.
Karoline Leavitt, Mr Trump’s spokeswoman, said the post “was not a campaign video, it was created by a random account online and reposted by a staffer who clearly did not see the word, while the president was in court”.