Donald Trump has said he will accept the results of the election if he wins.
The Republican nominee added that he would accept a “clear” result – but reserved the right to challenge a “questionable” result.
Donald Trump appeared at a rally in Delaware, Ohio, speaking for the first time after the final debate with rival Hillary Clinton.
He has been heavily criticized for suggesting that he might not accept the election result.
Latest polls suggest Hillary Clinton is ahead nationally and in key battleground states.
Speaking in Ohio, Donald Trump said, grinning: “I would like to promise and pledge to all of my voters and supporters and to all of the people of the United States, that I will totally accept the results of this great and historic presidential election – if I win.”
The billionaire also said: “I will accept a clear election result, but I will also reserve my right to contest and file a legal challenge in the case of a questionable result.”
During last night’s debate, when moderator Chris Wallace asked Donald Trump if he would accept losing to Hillary Clinton, the Republican nominee said he would “keep you in suspense”.
Donald Trump’s campaign manager, Kellyanne Conway, later insisted that the candidate had meant he would not concede until the “results are actually known”.
However the remark, which drew anger from some Republicans, is part of Donald Trump’s repeated claim that the election is “rigged” against him.
Donald Trump told the Ohio audience that the election was posing questions about “the fairness of our country”.
Former Republican presidential candidate Senator John McCain also released a statement implicitly criticizing Donald Trump’s debate comments.
John McCain, who lost to Barack Obama in 2008, said: “I didn’t like the outcome of the 2008 election. But I had a duty to concede, and I did so without reluctance.
“A concession isn’t just an exercise in graciousness. It is an act of respect for the will of the American people, a respect that is every American leader’s first responsibility.”
At the Ohio rally, Donald Trump also reiterated a claim he made during the debate against Hillary Clinton and President Obama, who he said were responsible for inciting violence at a Chicago rally earlier this year.
The crowd erupted into cheers of: “Lock her up!”
During the debate, Donald Trump called Hillary Clinton a “nasty woman”.
The Republican has trailed Hillary Clinton in the polls after facing damaging fallout over a video that emerged of him making inappropriate remarks about groping women.
When asked to address the allegations made against him by several women in the wake of the video, Donald Trump said the claims had been “largely debunked”.
Donald Trump’s comments come after a 10th woman came forward to accuse him of assault on October 20 at a news conference.
Karena Virginia said Donald Trump allegedly touched her breast at the US Open in 1998 and made offensive comments about her to a group of men.
Donald Trump and Hillary Trump are scheduled to appear at a charity dinner on October 20 in New York.
In the final debate against rival Hillary Clinton, Donald Trump has refused to commit to accepting the election result if he loses.
The Republican nominee told moderator Chris Wallace: “I will tell you at the time.”
For days Donald Trump has claimed the election is “rigged”.
The Las Vegas debate on October 19 continued the campaign’s bitter tone, with Donald Trump calling Hillary Clinton a “nasty woman”.
The final battle of wits came less than three weeks before election day on November 8.
The candidates declined to shake hands before and after the political sparring, setting the tone for what would later become yet another debate marked by shouting and interrupting.
Donald Trump appealed to the Republican establishment by vowing to appoint Supreme Court justices with a “conservative bent” who would overturn a key ruling that made abortion legal in the US and protect gun rights.
The billionaire also stuck to his pledge to deport undocumented immigrants and secure US borders.
Meanwhile, Hillary Clinton firmly declared she would stand up for the LGBT community, defend abortion rights, focus on restoring the middle class and equal pay for women.
“The government has no business in the decisions that women make,” she said.
In one of the more striking moments, Donald Trump twice declined to say whether he would accept the election’s outcome, breaking with the country’s long-standing tradition of a losing candidate’s concession after the votes are counted.
“That’s horrifying,” Hillary Clinton shot back.
“He is denigrating and he is talking down our democracy. And I, for one, am appalled that somebody who is the nominee of one of our two major parties would take that kind of a position.”
Donald Trump’s response drew sharp criticism from Republican Senator Lindsey Graham, who said the candidate was “doing the party and country a great disservice by continuing to suggest the outcome of the election is out of his hands and ‘rigged’ against him,” according to a statement.
When asked about her paid speech to a Brazilian bank in which she spoke of her dream of open trade and open borders, Hillary Clinton said she was talking about energy policy.
In one key exchange, Donald Trump attacked Hillary Clinton’s 30 years of “very bad experience” and she responded by going through her timeline, comparing where she was to where Trump was.
While she was in the White House helping to track down Osama Bin Laden, “he was hosting the Celebrity Apprentice”, Hillary Clinton said.
Donald Trump has faced damaging fallout after a video emerged of him making inappropriate comments about groping women, with senior Republicans deserting him.
When pressed about assault allegations made against him by several women in the wake of the video, Donald Trump said the claims had been “largely debunked”.
In addressing the groping accusations, Hillary Clinton said: “Donald thinks belittling women makes him bigger.”
“Nobody has more respect for women than I do,” Donald Trump said as the crowd was heard scoffing.
Donald Trump also blamed Hillary Clinton, whose campaign he said was responsible for drumming up the allegations.
Donald Trump and Hillary Clinton will take to the stage in Las Vegas on October 19 for the final debate in an increasingly bitter race for the presidency.
According to latest polls, Donald Trump is losing in key battleground states after facing a slew of assault allegations.
However, Hillary Clinton remains unpopular with many voters and has faced more bad headlines about her use of a private email server.
Most Americans will cast their votes on November 8.
Millions are expected to tune into the third and final debate at the University of Las Vegas, Nevada, which gets under way at 09:00 EDT and will be moderated by Fox News journalist Chris Wallace.
Hillary Clinton and Donald Trump will discuss six topics: The debt and entitlements, immigration, the economy, the Supreme Court, foreign flashpoints and their fitness to be president.
The Republican presidential candidate has faced damaging fallout after a video emerged of him making inappropriate comments about groping women, with senior Republicans deserting him.
In recent days Donald Trump has railed against the election process itself, warning the vote is “absolutely rigged” with “large-scale voter fraud” taking place.
The New York billionaire’s remarks prompted a scathing response from President Barack Obama, who said the Republican challenger should “stop whining”.
Donald Trump has invited Barack Obama’s estranged half-brother, Malik Obama – one of his supporters – as a guest.
He also invited Patricia Smith, whose son was killed in an attack on the US diplomatic mission in Benghazi, Libya, in 2012, while Hillary Clinton was US secretary of state.
In contrast to Donald Trump, Hillary Clinton has kept a low profile ahead of the debate to prepare for the showdown.
Hillary Clinton’s spokesman said the Democratic nominee was ready for whatever “scorched-earth” tactics her rival might try.
She is likely to face questions about a batch of hacked emails from the account of her campaign boss, released by WikiLeaks, that Donald Trump has seized on.
Before the last debate, Donald Trump appeared at a news conference with women who accused Bill Clinton of s**ual misconduct. Since then he has suggested Hillary Clinton took performance-enhancing drugs ahead of that meeting.
Hillary Clinton’s campaign has signaled their candidate will try to focus on policy.
Among her guests, Hillary Clinton is bringing Donald Trump critic Mark Cuban, as well as Hewlett Packard Enterprise CEO Meg Whitman, one of her highest-profile Republican backers.
President Barack Obama won the third presidential debate against his Republican rival Governor Mitt Romney according to two instant polls released by CNN and CBS News.
CBS News said that its poll of 521 undecided voters said the president had won the night by a 53% to 23% margin over his GOP counterpart, with a further 24% saying they thought it was a tie. CBS said the margin of error in its poll was +/- 4 percentage points.
CNN said Barack Obama won by eight percentage points among the debate watchers it polled, 48% to 40%, with a margin of error of +/- 4.5 percentage points. CNN noted the Obama win was within the margin of error. The network didn’t say how many respondents there were to its poll.