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 narrowly won Poland's presidential runoff election, beating Warsaw's liberal mayor, according to the final vote count. Nawrocki was backed by President Trump.