Harry Potter author Rowling, 51, hit out at Donald Trump in a series of eight tweets to her 11 million followers, blasting his apparent refusal to shake the hand of a disabled child which was caught on video.
"Trump imitated a disabled reporter," she vented. "Now he pretends not to see a child in a wheelchair, as though frightened he might catch his condition.
"(Unless related to him by ties of blood, and therefore his creations) are tread with contempt, because they do not resemble Trump," she continued.
Rowling said that her mother had used a wheelchair, adding: "So yes, that clip of Trump looking deliberately over a disabled child's head, ignoring his outstretched hand, has touched me on the raw.
ITV • WENN
Piers Morgan blasted JK Rowling over her Donald Trump tweets
Rowling hit out at the president in a series of tweets
She criticised Trump for appearing to ignore the disabled child
Piers Morgan's most famous Twitter spats
Thu, September 22, 2016
Good Morning Britain host, Piers Morgan's most outrageous quotes and Twitter spats.
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Piers Morgan's most outrageous quotes
"That man occupies the most powerful office in the free world and his daily outrages against civilised norms are having a corrosive effect.
"How stunning, and how horrible, that Trump cannot bring himself to shake the hand of a small boy who only wanted touch the President."
The footage appeared to show the Trump repeatedly ignoring the youngster as he reached up to shake his hand, but Piers Morgan, 52, has since tweeted a series of pictures showing the president greeting the child.
Morgan launched into a furious rant about Rowling on Twitter
He demanded that she apologise and remove her tweets
Taking to Twitter, the Good Morning Britain host hit out at Rowling for being active on Twitter but failing to apologise for her tweets, which seem now to have been based on false information.
"So @JK_rowling's been back on Twitter but neither deleted, nor apologised for, this disgraceful lie. Her Trump-loathing knows no honesty," he seethed.
Sharing three images of the previously debated handshake with his 5.98 million followers, Morgan added: "JK Rowling, in eight tweets, raged that Trump snubbed a disabled boy. This is Trump greeting that boy. Why won't she delete and apologise?"
The GMB presenter went on to add: “Now that things are sinking in, why have you not deleted your horrible lies about Trump & the disabled boy?”
He also attacked Chelsea Clinton – daughter of Bill and Hillary – after she retweeted the edited video.
She replied to Morgan: “Hello Piers-I hadn't seen the full video until now. I removed the retweet.
“And, the President should have shaken the boy's hand at the end.”
Express.co.uk has contacted a representative for JK Rowling asking for comment.