Tsetska Tsacheva

Bulgarian President-elect Rumen Radev has gained support from the vast majority of UK- and US-based voters, official data shows.

With 94.77% of ballot protocols outside Bulgaria having been processed, Radev has won 52.04% of the overall expat vote, while his opponent Tsetska Tsacheva has received some 43.75%, the Central Election Committee (CEC) says.

Bulgarian Prime Minister Boyko Borisov has deposited his resignation and that of his government, officials say.

An emergency vote is expected in Parliament tomorrow on his move to step down.

Rumen Radev is nearly 23% ahead of Tsetska Tsacheva in the race to become Bulgaria's next President, partial official results confirm.

With more than 99.33% of the vote counted, the socialist-backed candidate gets 59.35% support. This largely confirms exit poll data which on Sunday evening pointed to Radev as Bulgaria's President-elect.

Bulgarian Prime Minister Boyko Borissov has said he will step down after the candidate his party backed in the presidential elections, speaker of parliament Tsetska Tsacheva, got only 35 per cent in Sunday's run-off vote.

According to local media, Borissov also called for an early parliamentary election after the centre-right Tsacheva's defeat.

Tsetska Tsacheva, the main ruling GERB party's presidential candidate, has said she is ready to stand down as Parliament Speaker and even leave Parliament if there is agreement within the party.

Tsacheva has made the comment after exit polls prescribed a resounding victory of her opponent, socialist-backed candidate Rumen Radev.

Bulgarian Prime Minister Boyko Borisov has said he will step down next week, just after his candidate Tsetska Tsacheva emerged as a loser of the presidential election's runoff.

He has also urged an early election, warning the next government would be made by the socialist opposition party BSP and ethnic Turk-dominared DPS if his mandate is handed over to the socialists.

Rumen Radev, backed by the socialist opposition is poised to become Bulgaria's President, exit poll results show.

Two pollsters are indicating Radev is leading by a wide margin in the runoff vote held on Sunday.

Sunday's result, if confirmed, would constitute the first ever election loss of Prime Minister Boyko Borisov since the party was set up in the mid-2000s.

Main ruling GERB party's presidential candidate Tsetska Tsacheva has said she anticipates her victory in the runof taking place on Sunday.

"Today in Pleven [Tsacheva's hometown]... the wind is very strong. I was surprised myself. To me, this wind is the wind of victory," she has told reporters.

Socialist-backed candidate Rumen Radev has claimed the "moral victory" in the Bulgarian presidential elections while casting a ballot in the runoff on Sunday.

"Bulgarians should go to the polls today [Sunday] and congratulate themselves on a legitimately elected President, and this depends on all of us," he has argued after voting, as shown by bTV station.

Bulgarian President Rosen Plevneliev has made it clear he will work with whichever candidate wins the presidential runoff.