“To get into the Democrat National Convention, you must have an ID card with a picture...” the president wrote in an early morning tweet on Friday.
In years gone by, those wishing to attend the DNC have been asked to buy a ticket and provide photographic ID to gain entry.
But in 2020, proceedings have been broadcast on TV and online to help stop the spread of coronavirus.
This meant that ID and tickets were not necessary – and eagle-eyed Twitter users were quick to point this out to the president.
To get into the Democrat National Convention, you must have an ID card with a picture...Yet the Democrats refuse to do this when it come to your very important VOTE! Gee, I wonder WHY???
— Donald J. Trump (@realDonaldTrump)
“It’s virtual!!” one wrote, in apparent dismay at the president’s oversight, or lack of knowledge about the event.
“Trump is so far gone that he doesn’t realise the Democratic National Convention is virtual,” another added.
A third simply said: “You are an idiot, seriously.”
In recent weeks, Mr Trump has attempted to claim that this year’s presidential election could fall foul to voter fraud, as millions of Americans cast their votes via postal services due to the pandemic.
You are an idiot, seriously.
— David Weissman (@davidmweissman)
The president’s post appeared to be a broadside at Democrats’ opposition to voter identification at elections.
“Yet the Democrats refuse to do this when it come to your very important VOTE! Gee, I wonder WHY???(sic),” Mr Trump wrote in the second part of the tweet.
Traditionally, Republicans have tended to support stricter controls on voting – such as providing ID at polling stations – to combat “fraud”.
But multiple studies have shown that voter fraud in US presidential elections is extremely rare.
Democrats say that tightening voting regulations would unfairly impact minority groups, who are less likely to have ID.