A historian and populist firebrand who boasted about his brawls with soccer hooligans has narrowly won Poland’s presidential election, in a political upset that could torpedo the centrist government’s efforts to unspool the legacy of authoritarianism in the country.

Conservative Karol Nawrocki has won Poland's weekend presidential runoff election, according to the final vote count

A nationalist candidate backed by Donald Trump won Poland’s presidential election, defeating the centrist mayor of Warsaw and complicating efforts to shift the nation back into the European Union mainstream.