The country’s electoral commission ruled on Sunday that Calin Georgescu, an outspoken critic of Ukraine and NATO, could not compete in the do-over election.

Last week, Romanian authorities expelled two Russian diplomats, military attaché Victor Makovskiy and his deputy Evgeny Ignatiev, who were accused of foreign election interference tied to Mr. Georgescu’s campaign.

Chaos broke out in Romania's capital Sunday evening as incensed supporters of the far-right populist Calin Georgescu protested the electoral body's decision to reject his candidacy in a presidential election redo.