J.K. Rowling has been laughing at President Donald Trump on Twitter. Rob Stothard/Getty Images

US President Donald Trump tweeted about his writing prowess on Tuesday.

But Trump made an error in his boast, using the word "pour" instead of "pore."

The mistake was seized upon by the "Harry Potter" author J.K. Rowling and others on Twitter, including the account of the dictionary Merriam-Webster.

Trump deleted his original tweet, replacing it with one containing the correct use of the word "pour."

J.K. Rowling is laughing at US President Donald Trump on Twitter after he misspelled a word in a tweet boasting about his writing prowess.

Trump said: "After having written many best selling books, and somewhat priding myself on my ability to write, it should be noted that the Fake News constantly likes to pour over my tweets looking for a mistake. I capitalize certain words only for emphasis, not b/c they should be capitalized!"

Though he used the phrase "pour over," the grammatically correct version would have been "pore over." The president swiftly deleted the tweet and reposted it with the correct word in place.

Rowling, the "Harry Potter" author who has been a vehement critic of Trump, could not resist the urge to point and laugh at the mistake in a series of tweets before and after the president's correction.

Twitter

While many fans praised Rowling's reaction, some were critical. Rowling replied to one Twitter user who threatened burning or discarding the person's "Harry Potter" books, saying that reading the books should make her political leanings obvious.

The official Twitter account for the dictionary Merriam-Webster also made light of Trump's error. It provided definitions for "pore over" and "pour over" and went one step further, defining "comb over" - a not-so-subtle reference to the president's signature hairstyle.

The Trump biographer Tim O'Brien, who wrote "Trump Nation," also weighed in on Trump's tweet, disputing the claim that Trump had written many best-sellers.

"President Trump didn't write any of his books," O'Brien tweeted on Tuesday. "Ghostwriters on all of them."

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