Romania's populist far-right politician George Simion is making his bid for the country’s presidential election rerun in May as he seeks to rally nationalist voters after a controversial frontrunner was barred from the race last year.

Călin Georgescu has sparked Romania’s deepest political crisis in decades, uniting Romanian nationalists, senior Trump administration officials and the Kremlin.

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