This chapter asks whether Europe’s right-wing populist parties pose a threat to freedom of movement and to the Union’s fundamental values. The analysis shows that right-wing populist parties contribute to a better congruence of opinion between voters and parties in European party systems: as a result of their presence, the diverse preferences of voters on questions of immigration and the Union are reflected more fully. The author concludes from this that these parties have come into being and grown because there is a demand among certain groups of voters for their critical line on immigration and the EU. The chapter thus contends that right-wing populist parties put forward pertinent questions about the legitimacy of the EU, as well as about the limits of national, European, and global solidarity in the distribution of economic and social resources. The challenge for the established parties is to formulate answers to the questions that supporters of the right-wing populist parties ask.