Donald Tusk was condemned by the Prime Minister of Poland
Mr Tusk delivered a written message to European leaders on Tuesday, ahead of an informal summit in Malta this Friday.
The EU chief said the Union was facing "dangers worse than those when the Treaty of Rome was signed".
He has underlined an uncertain future for the European Union due to geopolitical dangers, coming from China and Russia, conflict in the Middle East, as well as "worrying decisions from the US administration".
Beata Szydło said she did not agree with Mr. Tusk's letter
I disagree with what Donald Tusk is writing in this letter
But Poland's leader Beata Szydło told a press conference she did not agree with Mr Tusk's letter, claiming it is a sign Mr Tusk does not wish for any changes within the EU.
Mrs Szydło stated: "There is no reflection on what is happening within the EU, no reflection on the fact Great Britain is leaving, no reflection on the fact reform is needed."
Mr. Tusk has underlined an uncertain future for the EU
However, Mr Tusk has brought up "the disintegration of the EU", warning that it will not rebuild the "mythical" independence of its member states, but rather force a dependence on Chinese, Russian, and US superpowers.
Mrs Szydło added: "I disagree with what Donald Tusk is writing in this letter. It encourages me in the belief, that Donald Tusk is representing the political elite that brought crisis upon the European Union."
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Mrs Szydło said that the letter offers no reflection of what is happening in the EU
"This letter is a sign he does not want to undertake any change within the EU, but rather cement the political and economic state, that led to severe crisis ."
The PM further said she wished for the EU to develop and remain safe for its citizens , and to fulfill the wishes of its people and not the elite.