US Republican vice presidential candidate Mike Pence has said his running mate Donald Trump will “absolutely” accept the election result, despite media “bias”.
His remarks came as Mr Trump attacked the media and the Clinton campaign for “rigging the election” in a series of tweets.
His adviser Rudy Giuliani has also accused Democrats of “cheating”.
Polls suggest Mr Trump is losing ground in some of the key battleground states.
Meanwhile Hillary Clinton’s running mate Tim Kaine has blasted Mr Trump’s election rigging claims as “scare tactics”.
Speaking on NBC’s Meet The Press, Mr Pence said the American people were “tired of the obvious bias in the national media” which was “where the sense of a rigged election goes”, but said: “We will absolutely accept the results of the election.”
“Elections always get pretty rough,” he added, but said the US has a tradition of “the peaceful transfer of power”.
‘Dishonest media’
Earlier, Republican presidential nominee Donald Trump, tweeted: “Election is being rigged by the media, in a coordinated effort with the Clinton campaign, by putting stories that never happened into news!”
His most recent tweet went further: “The election is absolutely being rigged by the dishonest and distorted media pushing Crooked Hillary – but also at many polling places – SAD”.
Meanwhile former New York Mayor Rudy Giuliani, who is Mr Trump’s campaign adviser, told CNN’s State of the Union that he’d have to be a “moron” to think that some elections, such as those in Philadelphia and Chicago, were going to be fair.
“I’ve found very few situations where Republicans cheat… they don’t control the inner cities the way Democrats do. Maybe if Republicans controlled the inner cities, they’d do as much cheating as Democrats,” he said.
“I’m sorry. Dead people generally vote for Democrats rather than Republicans,” he added.
Democrat vice presidential candidate Mr Kaine told ABC’s This Week Mr Trump was “swinging at every phantom of his own imagination” because “he knows he’s losing”.
“He’s blaming the media. He’s blaming the GOP. He’s saying that America can’t run a fair election.
“He’s making weird claims that, no, I couldn’t have assaulted this person, she’s not attractive enough to assault. How bizarre is that?… And this is what bullies do.”
Multiple women have come forward to accuse Mr Trump of groping or kissing them this week, following the emergence of a 2005 video tape in which the Republican nominee made obscene remarks about women.
He has repeatedly denied the claims, calling the women “horrible liars” and accusing the media of being an agent of the “Clinton machine”.
Mr Kaine denied that the Clinton campaign had anything to do with the women making accusations against Mr Trump.
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