The Bulgarian Socialist Party (BSP), the political faction that initially backed Rumen Radev for president, has now declared its opposition to his proposal for a referendum on Bulgaria's entry into the eurozone. This stance was outlined in a joint position by the BSP Executive Bureau and the Coalition Council of BSP-United Left.

Revival, the pro-Russian political party in Bulgaria, claims that its international diplomatic efforts have led to tangible results, including a shift in President Rumen Radev’s stance. The party states on its website that after two years of silence, during which Radev argued that a referendum on the euro was either impossible or outside his jurisdiction, the president has now decided to call for a referendum on the issue.

GERB leader Boyko Borissov has called on the Bulgarian parliament to swiftly reject President Rumen Radev's proposal for a referendum on adopting the euro, characterizing the move as a dangerous political game intended to stoke fear and fracture the ruling majority. According to Borissov, the proposal is strategically timed, as a positive convergence report from the European Commission is expected on June 4, potentially clearing the way for Bulgaria to adopt the euro on January 1, 2026.

National Assembly Speaker Natalia Kiselova commented on the proposed referendum on adopting the euro, emphasizing the need to review the reasons behind the initiative once it is formally submitted. Speaking in Nikolaevo, she noted that the proposal has not yet been received by the National Assembly, meaning the current discussion is based solely on the president's stated intention.

In response to the political reactions surrounding his proposal for a referendum on Bulgaria's adoption of the euro, President Rumen Radev defended his stance, emphasizing that he is "advocating for a referendum, not for a political party". He pointed out that the current approach to obtaining an extraordinary convergence report on the euro has been largely limited to declarations, which he believes is fueling public frustration and eroding trust in the government.

Prime Minister Rosen Zhelyazkov firmly defended Bulgaria’s European path and the country’s accession to the eurozone in response to President Rumen Radev’s call for a referendum on the euro. Zhelyazkov emphasized that Bulgaria had already committed to joining the eurozone through the ratification of the Treaty on Accession to the European Union.

Borislav Tsekov, a constitutional law expert, has voiced strong opposition to President Rumen Radev's recent proposal for a referendum on Bulgaria’s adoption of the euro. Tsekov stressed to BGNES that while the President has the right to submit such a proposal, it is ultimately the National Assembly that must decide whether a referendum is held.

President Rumen Radev has submitted a proposal to the National Assembly to hold a referendum on Bulgaria’s adoption of the euro in 2026. The proposed question is straightforward: “Do you agree that Bulgaria should adopt the single European currency, the euro, in 2026?”