Washington: Hillary Clinton's campaign has said it will participate in recounts of election ballots across three battleground states that were crucial to putting Donald Trump in the White House.
Mr Trump won the industrial heartland states of Wisconsin, Pennsylvania and Michigan by razor-thin margins in the presidential election on November 8.
A push for recounts was launched by Jill Stein, the Green Party candidate, who claimed electronic voting terminals could have been hacked.
Marc Elias, the Clinton campaign's general counsel, said Ms Clinton's team had carried out an extensive review that "has not in our view resulted in evidence of manipulation of results".
But he said: "We believe we have an obligation to the more than 64 million Americans who cast ballots for Hillary Clinton to ensure that an accurate vote count will be reported.
"We intend to participate in order to ensure the process proceeds in a manner that is fair to all sides."
Late on Friday, Ms Stein secured a recount in Wisconsin. Election volunteers there will begin re-examining all three million ballots by hand this week with a completion deadline of December 13.
For Mr Trump's victory in the presidential race to be overturned all three states would have to be re-assigned to Ms Clinton. Such an outcome was dismissed by the White House, which backed Mr Trump's legitimacy as the President-elect.
A spokesman for the Obama administration said the Kremlin had probably hoped to raise such doubts about the integrity of the election process through its hacking attacks during the election, including on the Democratic National Committee email system.
The spokesman said: "We stand behind our election results, which accurately reflect the will of the American people. We are confident in the overall integrity of electoral infrastructure and we believe our elections were free and fair from a cybersecurity perspective."
US President-elect Donald Trump called the request for a recount a "scam" by the Green Party.
The Green Party scam to fill up their coffers by asking for impossible recounts is now being joined by the badly defeated & demoralized Dems
— Donald J. Trump (@realDonaldTrump) November 27, 2016
"This is a scam by the Green Party for an election that has already been conceded, and the results of this election should be respected instead of being challenged and abused, which is exactly what Jill Stein is doing," he said in a statement.
"This recount is just a way for Jill Stein, who received less than one per cent of the vote overall and wasn't even on the ballot in many states, to fill her coffers with money, most of which she will never even spend on this ridiculous recount," Mr Trump said.
"What a pack of sore losers," Kellyanne Conway, who was Trump's campaign manager and is now a senior adviser, said in a statement. "After asking Mr Trump and his team a million times on the trail 'Will HE accept the election results?', it turns out Team Hillary and their new BFF Jill Stein can't accept reality."
Mr Trump won Michigan by 10,704 votes, Pennsylvania by 70,010, and Wisconsin by 27,257 votes.
His lead in Michigan was just 0.3 per cent and the result has not yet been officially certified. The state was still considered too close to call by the Associated Press. The deadline for Ms Stein to apply for a recount in Michigan is Wednesday. Mr Trump will then have seven days to object and the election board will make a decision.
The deadline for applying in Pennsylvania passed a week ago, but that can be challenged and overturned in court. Ms Stein's deadline for doing that is tomorrow and she has made clear her intention to go ahead.
Ms Stein launched her recount effort on November 23. She needed to raise $US7 million ($9.4 million) for application and legal costs and by yesterday morning had reached $US5.7 million.
She said it was a "hack-riddled election" and there was a need to "shine a light on just how untrustworthy the US election system is".
According to one group of computer scientists, Ms Clinton's votes were seven per cent lower than expected in counties that used electronic machines to tally votes. They said it was unlikely cyber attacks were responsible, but the only way to be sure was to examine the ballots and electronic equipment.
Telegraph, London, Reuters, Washington