And J.K. Rowling has responded with a great putdown - by literally laughing off his silly claim in a series of "hahahahaha" tweets.

hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha *draws breath* hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha https://t.co/gbionAPK9Z

— J.K. Rowling (@jk_rowling) July 3, 2018

Taking to Twitter, Trump wrote: "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!"
Trump might "pride myself on my ability to write", but the Harry Potter author was quick to point out that a ghostwriter actually penned all his books!
Apart from a series of "hahahaha" tweets, J.K. Rowling stated: "wipes eyes, tries to control breathing Seriously, @realDonaldTrump is the Gratest Writer on earth."
Obviously the typo in "gr(E)atest writer" was an intentional pun. That, or she forgot to add a question mark/exclamation mark in her tongue-in-cheek comment. Either way, Donald Trump certainly "grates" on most rational thinking people, that's for sure.

hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha *draws breath* hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha https://t.co/gbionAPK9Z

— J.K. Rowling (@jk_rowling) July 3, 2018

hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha *draws breath* hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha https://t.co/gbionAPK9Z

— J.K. Rowling (@jk_rowling) July 3, 2018

'written' and his ghost writer's talked to the press
hahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahaha

— J.K. Rowling (@jk_rowling) July 3, 2018

*wipes eyes, tries to control breathing*
Seriously, @realDonaldTrump is the Gratest Writer on earth.

— J.K. Rowling (@jk_rowling) July 3, 2018