Conservative Karol Nawrocki’s victory in Poland’s weekend presidential runoff has set the country on a more nationalist course — and cast doubt on the viability of the centrist government of Prime Minister Donald Tusk after the defeat of his liberal ally.

Poland's new president Karol Nawrocki, a political outsider backed by the far right, won with a campaign echoing Donald Trump. His victory closes the door on liberal reforms and paves the way for a nationalist comeback.