Luxembourg's foreign minister is denouncing moves by the new Polish government to reduce the ability of the nation's top court to act as a check the government's power, suggesting that the European Union may have to intervene.

Since taking power last month, the Law and Justice party has moved to stack the Constitutional Tribunal with its supporters and now plans legislation that would endanger its ability to rule on contentious issues.

Luxembourg's Jean Asselborn, whose country holds the rotating EU presidency, told Germany's ZDF television Monday developments in Poland are "frightening."

He added that the Polish government apparently doesn't know "that we are a community of values, that we not only can intervene but must intervene if things are going the wrong way in terms of the rule of law."