Bulgaria's newly-elected National Assembly held its first session on Monday amid internal disputes and public protests, according to Xinhua.

It failed to elect a chairperson despite a constitutional requirement to do so at the first session since being elected at the end of October.

The 240 legislators from eight parties and coalitions were unable to secure a simple majority for any candidate. Five parties nominated their candidates for the position, but none gained enough support.

The two leading candidates, Raya Nazaryan from the GERB-UDF coalition and Andrey Tsekov from the We Continue the Change-Democratic Bulgaria (PP-DB) coalition, qualified for the runoff, initially backed by 68 and 67 members of parliament (MPs), respectively.

In the runoff, Nazaryan received 68 votes from her coalition's 69 MPs, while Tsekov gained 68 votes, including 37 from his coalition, 19 from MPs in the Alliance for Rights and Freedoms (ARF) coalition, and 12 MPs from the Morality Unity Honour (MECh) party.

The parliament will reconvene again on Wednesday in a renewed attempt to elect a chairperson.

Ahead of the plenary session, GERB leader Boyko Borissov told reporters that the next government could be a coalition of GERB-UDF, PP-DB, the 20-seat Bulgarian Socialist Party, and the 18-seat There Is Such People (ITN) party. He also proposed himself as the coalition's prime minister.

ITN's leader Toshko Yordanov, however, dismissed the idea, remarking that his party has not been consulted. "As far as I understand from my colleagues, the first political force has not spoken to any of them either," Yordanov said, calling Borissov's proposed role "absurd."

Meanwhile, protests erupted in the city center. Some protests organized by parties excluded from parliament were labeling the Bulgarian National Assembly "illegitimate." Other groups were demanding changes, including a new electoral code and improvement of road safety.

The Oct. 27 parliamentary elections now face legal scrutiny after the Constitutional Court launched an investigation Friday into alleged irregularities in 52 polling stations. This probe followed a formal request by 67 MPs, who cited video footage purportedly showing ballots misallocated between parties, affecting national results.

On Monday, the court launched a second investigation after 58 MPs raised additional concerns, alleging "numerous and various violations" during the elections, some of which, they claimed, constituted crimes.