Romania's far right has four days to find a replacement presidential candidate for pro-Russian Calin Georgescu, who is unlikely to succeed on Tuesday in his attempt to overturn a ban on his standing in an election rerun in May.

BUCHAREST—On a recent day, nationalist politician Călin Georgescu made his way through a crush of people to enter a district court in Romania’s faded belle epoque capital to argue that he should be free to run in coming presidential elections.

A top Romanian court has rejected an appeal by far-right politician Calin Georgescu to lift a ban on his candidacy in the presidential rerun