Polish court says some EU law unconstitutional, deepening dispute

FILE PHOTO: European Union and Polish flags flutter in Mazeikiai, Lithuania April 5, 2019. REUTERS/Ints Kalnins

WARSAW (Reuters) - Poland's highest court ruled on Thursday that parts of EU treaties are incompatible with the Polish constitution, challenging a key tenet of European integration in a sharp escalation of a dispute between Brussels and Warsaw.

The European Commission responded by saying the ruling raised serious concerns about the primacy of EU law, setting it on a collision course with Poland's nationalist rulers after years of legal and political wrangling.