WARSAW (Reuters) -Poland holds a presidential election run-off on Sunday, with the ruling party's candidate, liberal Warsaw mayor Rafal Trzaskowski, facing nationalist Karol Nawrocki, in a vote crucial for the country's pro-European course.

Poland’s presidential election has come down to a stark ideological choice: a liberal pro-European mayor versus a staunch nationalist conservative. They are polling so close that the outcome is impossible to predict in the run-off round on Sunday.

Poland’s presidential election will determine whether the country can overhaul controversial judicial reforms and remain a reliable partner in the European Union after nearly a decade of divisive right-wing populism.