The European Council president has claimed there is a "special place in hell" for Brexiteers.
Speaking in Brussels, Donald Tusk said: "I have been wondering what the special place in hell looks like for those who promoted Brexit without even a sketch of a plan how to carry it."
His comments followed a meeting with Irish premier Leo Varadkar and European Commission president Jean-Claude Juncker about the backstop arrangement.
After his address, the words were then repeated on his official Twitter account.
The comments have polarised social media users, with some agreeing with his statement and others fiercely opposing it.
talkRADIO's Julia Hartley-Brewer tweeted: "It’s probably nicer than the special place in Hell reserved for overpaid Brussels bureaucrats who think voters shouldn’t get to decide how their own country is run, Donald."
Conservative MP Anna Soubry also weighed in on Twiter, posting: "Donald Tusk sitting on the fence as ever! #TellingItAsItIs."
Theresa May is set to meet with Mr Tusk and other EU officials in Brussels on Thursday to discuss the Brexit deal.