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

Poland has elected Karol Nawrocki, a conservative historian and staunch nationalist, as its next president in a closely watched vote that signals a resurgence of right-wing populism in the heart of Europe.

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.