Here's what Mr Trump had tweeted:
The tweet was deleted and reposted like this:
He eventually corrected the spelling of the word 'heal' and tweeted again:
Our great country has been divided for decades. Sometimes you need protest in order to heal, & we will heal, & be stronger than ever before!- Donald J. Trump (@realDonaldTrump) August 19, 2017
Twitter has since gone into overdrive tweeting about the typo, reacting pretty much the same way when Mr Trump accidentally tweeted the word 'covfefe'.
Among those mocking Mr Trump is none another Merriam-Webster dictionary.
heal (to become healthy again)- Merriam-Webster (@MerriamWebster) August 19, 2017
heel (a contemptible person)
he'll (he will)
The tweet has collected over 40,000 'likes' and more than 15,000 retweets so far - and still counting.
In his latest tweet, Trump commands America to heel.- Stephen King (@StephenKing) August 19, 2017
Trump: I want to tail all of you laughing at me for misspelling heel that innyone can make a missteak! Sew, git off my ass.- keith hall (@kfhall0852) August 20, 2017
Do not forget. Misspellerinchief #realdonaldtrump wrote heel for heal 4 times in 2 tweets & he wants english only immigrants. Ignorant!- Antonio G Pizarro (@apoloniohombre) August 19, 2017
The very sole of our nation depends on it pic.twitter.com/PDTtZHO827- Gene Demby (@GeeDee215) August 19, 2017
Trump makes the same spelling mistakes two tweets in a row. pic.twitter.com/N5q7TaKk9i- Erick Fernandez (@ErickFernandez) August 19, 2017
Let's unite and #heel this country.- Jeff Giesea (@jeffgiesea) August 19, 2017
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Aide: Sir, typo- maura quint (@behindyourback) August 19, 2017
Trump: Fixed it
Aide: No still there, "heel"
Trump: Yea, heel!
Aide: You mean "heal"
Trump: No I dont
Aide: Gimme your phone pic.twitter.com/uwzo8kzKKP
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