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"I capitalize certain words only for emphasis, not b/c they should be capitalized!".

The Harry Potter author was left in a fit of laughter after the US President tweeted about his writing ability.

Instead of typing "pore over", which means careful studying, the billionaire president typed 'pour over, ' which has nothing to do with studying.

J.K. Rowling attends the press preview of Harry Potter and the Cursed Child at the Palace Theatre in London in 2016.

The only problem? He initially made a grammar mistake in the very tweet where he pointed out he's a "best selling author" (ignoring the fact that his books were all actually ghostwritten by other authors).

Just as America was celebrating its 242nd Independence Day, the great nation realised it's not totally free from its President's tweets.

For official confirmation on the subject, Trump biographer and author of the 2005 book, TrumpNation: The Art of Being The Donald, Tim O'Brien weighed in.

She even commented that Trump didn't write his books, as a ghostwriter came forward - suggesting that he's taking credit where credit is not due.

"But the dictionary's Twitter account couldn't resist one final jab at the president, and specifically, his infamous "do: "'comb over" [is] 'to comb hair from the side of the head to cover the bald spot'". One fan, in particular, their details redacted by Rowling during a retweet, threatened to burn their collection of Rowling's books in response to her acerbic commentary on American politics.

Rowling seemed to enjoy the President's take on his authorial prowess, tweeting: 'hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha *draws breath* hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha'.