Politico says that:
four crucial provisions of the main EU treaty clash with - and should not prevail - over the Polish constitution.
Article 1 that sets up the EU as an 'ever closer union amongst the peiples of Europe."
Article 2 that sets up the EU values on "respect for human dignity, freedom, democracy, equality, the rule of law, and respect for human rights, including the rights of persons belonging to minorities" in a society which "pluralism, non-discrimination, toletance, justice, solidarity and equality between men and women prevail."
Article 4.3 that sets up the principle of "sincere cooperation" between EU members and to "assist each other in carrying out tasks which flow from the treaties."
Article 19 that sets up the Court of Justice for the EU (CJEU) and which interprets, implements and ensures observation of EU law