Former Bulgarian ruling party GERB could table a no-confidence vote against the cabinet of PM Plamen Oresharski, said GERB leader and former Bulgarian PM Boyko Borisov.

In an interview for the Bulgarian National TV Saturday, Borisov said that his party is considering ending their boycott of parliamentary work.

"At the very moment that authorities take the parliamentary immunity of [nationalist Ataka party leader] Volen Siderov, we will be back in parliament to table a no-confidence vote," said the rightist leader.

According to Borisov, reining in Siderov is vital to ensuring the peaceful work of parliament.

The former PM has previously said GERB will return to parliament - at that time, on the condition that socialist leader Sergey Stanishev "apologizes" for the Socialists' unwillingness to dialogue with GERB.

Of late, the nationalist leader has embarked on a series of provokative stunts, facing of citizens, journalists and even Bulgarian President Rosen Plevneliev.

Borisov further stated that in his view ongoing street protests, which Saturday enter their 23rd consecutive day, show that cabinet will fall and new elections will take place.

"There is going to be a new snap vote, probably in September," said he.

"They know that they are going to fall. They are simply trying to buy as much time as they can," commented the former PM.

Friday Bulgarian President Rosen Plevneliev, formerly a minister in the Borisov cabinet, issued an address to the nation, calling for early elections.

Although he expressed support for protesters, in his interview Saturday Borisov criticized an emerging new rightist project, saying it is being sponsored by controversial banker Tsvetan Vasilev.

With 97 MPs out of 240 GERB has the largest parliamentary group in the current Bulgarian parliament, which resulted from May 12 early elections.

However, the former ruling party is isolated by the other three parliamentary groups and did not manage to pull through a viable cabinet proposal.

The Oresharski cabinet was elected with the votes of the Bulgarian Socialist Party and the liberal Movement for Rights and Freedoms, which together have precisely 120 MPs.

The two governing parties have to rely on nationalists Ataka for achieving quorum in parliament.

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