European elections of 2019 will be a test case for the mainstream European parties and their legitimacy. Having faced serious challenges in national elections due to changing political cleavages and emergence of new political movements, their European postures will now be put into test. A lot depends on how the agenda for the elections will look like. Without an all-European crisis, national issues will be likely to dominate, which might weaken transnational synergies. How will the European and national elections of 2019 affect the European party field and political dynamics within the EU institutions? Will the Eurosceptic parties this time succeed in building stronger coalitions?