U.S. President Barack Obama spoke with Bulgarian Prime Minister Boyko Borisov by phone on Friday.
But our correspondent says that the clashes on Tuesday were the last straw for Mr Borisov.
On Monday, the President will host Prime Minister Borisov of Bulgaria at the White House.
Mr Borisov has since backed down, saying he will leave it for others to decide.
Prime Minister Boiko Borisov has resigned and taken with him his entire cabinet.
Some commentators said Mr Borisov's resignation may have been designed to save too much damage to the ruling party.
Bate Borisov produces the surprise result of match day 1 when they travel to France and beat Lille 3-1.
In December the idea gained surprising support from the prime minister, Boyko Borisov.
"Our power was handed to us by the people, today we are handing it back to them, " Mr Borisov said.
Bate Borisov bubble has now officially burst after Valencia wins 4-2 and the Belorussian side have now slipped to third.
Mr Borisov said he would try to form a minority government if his appeal to have the election result cancelled failed.
The centre-right Gerb party - led by former Prime Minister Boiko Borisov - is narrowly ahead with nearly all votes counted.
But the BBC's Central Europe correspondent Nick Thorpe says that the clashes on Tuesday were the last straw for Mr Borisov.
But in the following match the Bate Borisov bubble deflates a little.
Speaking in his first public appearance since the vote, Mr Borisov said his party would ask the constitutional court to cancel the election results.
Ex-Prime Minister Boiko Borisov said his centre-right Gerb party's chances had been damaged by comments from other parties on the eve of the polls.
Prime Minister Boyko Borisov told local media that this would remain the case even if Bulgarians voted in favour of a new nuclear plant.
Many Bulgarians who do not like the government of Boyko Borisov, a populist prime minister (who once lived with Ms Borislavova), fret about fraying democracy.
But Muller hit back just five minutes later to claim a point and send both teams through to the next stage following BATE Borisov's defeat by Lille.
In its ruling, the court said Mr Paksas had given Mr Borisov privileged treatment, breaching the article of the constitution declaring all people equal under the law.
Premier League Everton shrugged off the loss of 10 first team players to record a superb 2-1 Group I victory at Belarussian side BATE Borisov -- their second successive win.
Last month the Lithuanian Constitutional Court ruled that Mr Paksas violated the constitution when he gave citizenship to Russian businessman Yuri Borisov, the main backer of his successful election campaign.
The ruling center-right party of Prime Minister Boiko Borisov, which won parliamentary elections in 2009, has been steadily losing public support in the wake of the country's worst economic downturn in a decade.
Correspondents say that while budget cuts have felled a series of governments around Europe, Mr Borisov - a former bodyguard to Bulgaria's Soviet-era dictator Todor Zhivkov - had until recent weeks seemed relatively immune.
Striker Jo made it 4-0 in the 82nd minute but substitute Louis Saha was sent off in stoppage time for raising his hand to Athens defender Juanfran and will miss the next match against BATE Borisov.
The manner of Belarus' victory seemed to vindicate Bernd Stange's decision to axe several high-profile players, including Stuttgart star Alexander Hleb, brother Vyacheslav and BATE Borisov midfielder Igor Stasevich, as he attempts to build for the future.
Corruption among prosecutors and the judiciary makes it hard to obtain convictions even after the police arrest suspects and collect evidence, complains Boiko Borisov, who resigned as Bulgaria's chief policeman to win a parliamentary seat for Mr Saxe-Coburg's party.
Mr Borisov, who denies wrongdoing or involvement in the affair, argued on Thursday that his party's chances had been hurt by news conferences held by other parties in relation to the raid on Saturday, when by law electoral campaigning must stop.
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