Jean-Claude Juncker has criticised populists including US President-elect Donald Trump
The EU Commission president railed against press coverage in the UK describing High Court judges as "enemies of the people" over Brexit and insisted no more countries will be leaving the bloc.
He criticised Mr Trump's suggestion that the European Union is on the verge of collapse and accused populists like him of creating "division and disharmony in our communities".
The chief eurocrat made the remarks in a speech to the Academy of European Law, in the German city of Trier, as the US geared up to officially welcome the Republican as its new president.
Mr Trump, a eurosceptic who is close to figures including former Ukip leader Nigel Farage, has been locked in a war of words with Brussels over the uncertain future of the bloc amid a growing anti-establishment movement.
Mr Trump will be confirmed as the 45th US President in a lavish inauguration ceremony this evening
Mr Juncker said populists like France's Marine Le Pen are subverting the rule of law
And Mr Juncker said: "Right across the world, we have seen populist movements wanting – and sometimes succeeding – to subvert the rule of law and create divisions and disharmony in our communities.
"But the whole basis of our law is that it should not be subverted by any movement, even one supported by the majority or the powerful.
"That is why I see it as our duty to ensure our Law is defended and upheld. Some people say that makes judges 'enemies of the people'. But I believe it makes them the complete opposite."
He also took the opportunity to criticise a number of member states for refusing to implement laws passed by his Commission and vowed to crack down on non-compliance with EU law.
We have seen populist movements wanting to subvert the rule of law and create divisions and disharmony in our communities
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EU chief Jean-Claude Juncker
Hungary is currently fighting an attempt by Brussels to impose migrant quotas across the continent, whilst Poland is locked in a battle with eurocrats over its judicial system and Italy is defying them on budget deficit rules.
Mr Juncker lamented: "There is something new in the European Union. In former times the general rule was that adopted rules should be implemented by all the member states. Today, things have changed.
"We are adopting – on a proposal of the Commission – a law…and member states are not implementing that law. That is the reason why I am saying that we have to defend the virtue of law.
"We have acted – as the Commission – whenever we have identified a threat to the rule of law. And I assure you – we will continue to do so."
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Jean-Claude Juncker is a Luxembourgish politician. Since 2014, Juncker has been President of the European Commission, which is the European Union Executive Branch.
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Mr Juncker trained as a barrister in his native Luxembourg and passed the bar, but never worked in the legal profession and instead chose to purse a career in politics.
But he said that even though he has "passion for the law" he does not necessarily "want more of it", pointing out that Brussels has significantly reduced its legal meddling under his leadership.
The chief eurocrat's remarks came days after he significantly toned down his remarks towards Britain over Brexit, suggesting that Brussels is preparing a more conciliatory line for once Article 50 has been triggered.
Mr Juncker said he wanted to secure "good results" for both Britain and the EU in the negotiations and strongly hinted that the bloc will seek a transitional deal to minimise any economic impact.