A new party - Bulgaria of Citizens Movement - chaired by former European Commissioner Meglena Kuneva was set up on Sunday.
Under the party's statute, it is a right party which will not admit as members collaborators with the former secret services.
Its leaders pledged not to enter into coalitions and not to cooperate with political forces whose election results were achieved through forgery, the state-run Bulgarian National Television reported.
Among the ranks of the new party are former members of the opposition Union of Democratic Forces, SDS, the Democrats for Strong Bulgaria, DSB, and the National Movement for Stability and Progress, NDSV.