Slovakia said Wednesday it had mounted a legal challenge to the EU's plan to distribute 160,000 asylum-seekers among member states under a quota system.

"The Slovak republic has officially filed a lawsuit against the Council of the European Union, to the highest court ... in Luxembourg," leftist Prime Minister Robert Fico said.

He added that the suit challenges "so-called mandatory quotas" on refugee re-location, which EU interior ministers adopted in September amid fierce opposition from central and eastern European member states.

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