The victory of Karol Nawrocki, who is backed by the previous right-wing governing party, will complicate Prime Minister Donald Tusk’s efforts to advance his liberal agenda.

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A vote seen as a test of the power of populist nationalism in Europe was too close to call, with exit polls putting the two contenders neck and neck.

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Here’s what to know about Poland’s presidential runoff, which sets up a showdown between the governing party and resurgent nationalists.

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A runoff election on Sunday pits a centrist against a nationalist who represent mainstream parties. The outcome is unclear given that many under 30 prefer candidates on the political fringes.

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