With Karol Nawrocki elected president, the conservative Law and Justice party retains its ability to block the agenda of pro-E.U. prime minister Donald Tusk.

The victory of Karol Nawrocki, who is backed by the previous right-wing governing party, will complicate Prime Minister Donald Tusk’s efforts to advance his liberal agenda.

Poland faces a razor-thin presidential run-off, with polls showing just a one to two per cent gap between the leading candidates: nationalist candidate Karol Nawrocki and liberal Warsaw Mayor Rafał Trzaskowski,