The staunch NATO critic has been barred from running for the country's top office

Romania's Constitutional Court has rejected an appeal by presidential hopeful Calin Georgescu against the Central Electoral Bureau's (BEC) decision to bar him from taking part in a new election in May, according to the Associated Press.

On Tuesday, the court upheld BEC's ruling, confirming the invalidation of Georgescu's candidacy. The electoral body had dismissed his bid on Sunday, citing over 1,000 challenges. Georgescu was the clear favorite for the election rerun, polling between 40% and 45% in most recent surveys.

According to media reports, a crowd of supporters gathered outside the court in Bucharest, shouting "traitors" and "we are going nowhere." They also chanted "Calin Georgescu is president" and "freedom," with one woman holding a sign that read 'Stop dictatorship.'

Georgescu scored an unexpected win in November's presidential election first round, receiving 23% of the vote. The result, however, was promptly annulled by the Constitutional Court over alleged "irregularities" in the campaign. The politician is known as an outspoken critic of NATO and the EU, and a staunch opponent of supporting Ukraine.

Preliminary findings of an investigation into the elections scandal, reported by media early this year, indicated the campaign "irregularities" likely were the result of actions of a consulting firm associated with the pro-Western National Liberal Party (PNL). The firm presumably tried to derail another candidate, but inadvertently boosted Georgescu instead.

READ MORE: Protests erupt as anti-NATO Romanian presidential favorite booted from vote (VIDEO)

Last month, Georgescu was briefly arrested and charged with "promoting fascist, racist, or xenophobic ideologies" and plotting "anti-constitutional acts."

The politician has dismissed all the accusations as politically motivated, claiming that was being targeted by the Romanian "deep state," and asked US President Donald Trump for help. Billionaire Elon Musk, a close ally of Trump, then reacted to Romania's election turmoil, calling the decision to bar Georgescu "crazy."