Bulgaria will hold new early elections in just few months, a key figure from the biggest political party has forecast.

"I am convinced that in a few months we will be faced with new early parliamentary elections,” Tsvetan Tsvetanov, former Interior Minister and Deputy Chairman of GERB, told the state-owned TV channel on Monday.

Bulgaria headed to the polls on May 12 in early elections after the center-right administration of Boyko Borisov resigned following nationwide protests that turned violent.

The surprise resignation came after some of the largest demonstrations in the EU's poorest member since the collapse of communism two decades ago.

GERB party, which gained a slight lead in the early elections, but not enough to form a stable minority government, wants the results voided on the grounds of a legal violation.

On Saturday, a day before the elections, when by law electoral campaigning is forbidden, prosecutors announced they had raided a printing shop and found 350,000 illegally printed ballots in a printing house owned by a Gerb official.

The party claims its chances had been hurt by news conferences held by other parties in relation to the raid on Saturday.

A political party has the right to ask annulment of election results, but only through the intermediation of five institutions - the President, the Supreme Court of Cassations, VKS, the Supreme Administrative Court, VAS, through their respective judges' plenum, the Chief Prosecutor, and at least one fifth of the sworn-in Members of the Parliament.

The latter is interpreted by the majority of legal experts as needing to have a convened Parliament in order for GERB to be able to ask the Constitutional Court for a void through its MPs.