Conservative Karol Nawrocki narrowly won Poland's presidential runoff election, beating Warsaw's liberal mayor, according to the final vote count. Nawrocki was backed by President Trump.

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.

Poland is set to hold a presidential runoff election in which a right-wing nationalist and a pro-European liberal are running neck-and neck.