European Council President Donald Tusk | Emmanuel Dunand/AFP via Getty Images Brexit is ‘vaccine’ against Euroskepticism, says Tusk ‘No one even tried to discuss’ Brexit during leaders’ dinner.

Brexit acted as a “vaccine” against Euroskepticism that has led to a tempering of hard-line positions by anti-EU parties across the Continent, said European Council President Donald Tusk.

Speaking to reporters after a meeting of EU leaders in Brussels following the EU election results on Sunday night, he said, “Europe is the winner in these elections.”

“I have no doubt that one of the reasons that people on the Continent voted for a pro-European majority is also Brexit,” said Tusk. “As Europeans see what Brexit means in practice they also draw conclusions. Brexit has been a vaccine against anti-EU propaganda and fake news.”

He added that some major Euroskeptic parties had abandoned anti-EU slogans and “presented themselves as EU reformers" — a development he said was "positive."

Asked if the U.K. was using the Brexit extension granted by EU leaders at the last summit in April wisely, he said he wanted to be as “delicate as possible.” There is a race to succeed Theresa May as Tory leader and prime minster following her resignation announcement last Friday.

But he added: “We are all aware of the state of things in London — nothing promising I should say.”

Tusk said that during the leaders’ dinner “no one even tried to discuss” Brexit.