Emmanuel Macron has called on European leaders to “stand firm” against the “anger-mongers backed by fake news” who promoted Brexit.
The attack came as part of a 1,600-word opinion piece published by Mr Macron in newspapers in all 28 EU member countries.
The French President said Brexit “symbolises the crisis of a Europe that has failed to respond” to international crises such as mass migration and called for cross-EU reform.
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Mr Macron said: "Never since the second world war has Europe been so essential. Yet never has Europe been in such danger. Brexit stands as the symbol of that.
"Who told the British people the truth about their post-Brexit future? Who spoke to them about losing access to the EU market? Who mentioned the risks to peace in Ireland of restoring the border? Retreating into nationalism offers nothing; it is rejection without an alternative.
"And this is the trap that threatens the whole of Europe: the anger-mongers, backed by fake news, promise anything and everything."
Among the reforms proposed by Mr Macron were a “rethink” of the Schengen area of free movement, and a creation of a common border force and European asylum office.
Macron should 'look to own people first'
Speaking on BBC Radio 4’s Today programme, foreign secretary Jeremy Hunt said he did not agree with Mr Macron’s analysis of what he referred to as a “robust” referendum campaign.
He said: “Exaggerated claims were made on both sides of the debate and that’s what happens not just in referendums but in general elections.
“British people are quite smart enough to be able to listen to the claims made by politicians in these situations and make their own judgement.”
Brexit campaign group Leave.EU tweeted that Macron should “look to his own people first before lecturing Britain."
The latest polls revealed Mr Macron had a disapproval rating of up to 71 per cent as the so-called ‘yellow vest’ protests continue to rock France.