Romanian far-right politician Calin Georgescu on Tuesday stopped short of endorsing any other potential candidate after being definitively barred from standing in May's presidential election rerun, adding to uncertainty over who would replace him.

It’s a close question, given the role of Russia and the tender age of the country’s democracy.

Romania’s constitutional court upheld a decision banning presidential front-runner Calin Georgescu from May election, ending the bid that plunged the country into the biggest political crisis since the fall of communism.

Romania's top court upheld a decision to ban far-right candidate Calin Georgescu from standing in a presidential election rerun in May, broadcaster Digi24 cited sources as saying on Tuesday, leaving his allies with four days to find a replacement.

The 62-year-old Georgescu will lodge his appeal to Romania’s Constitutional Court in the capital Bucharest, a day after the Central Election Bureau rejected his candidacy, accordingly to close political ally George Simion. The court will have 48 hours to make a decision.

Romania’s electoral body has rejected Calin Georgescu’s candidacy in the presidential election rerun, after the far-right populist won the first round of last year’s race before a top court annulled the election.

Romania's central election authority on Sunday barred far-right pro-Russian candidate Calin Georgescu from running in May's presidential election re-run, a decision likely to deepen a constitutional crisis in the European Union and NATO member.

Romania’s largest far-right party is scrambling to find a candidate after the independent front-runner it supported was barred from May’s presidential election.