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.

Karol Nawrocki, a right-wing nationalist, flipped exit poll results and defeated Warsaw Mayor Rafal Trzaskowski.

Poland has elected Karol Nawrocki, a nationalist conservative, as its next president — a win that signals a turn to the right in one of the European Union's member states.