Republican candidate Donald Trump said that the US presidential race was being "rigged" against him at voting locations, questioning the 8 November election's fairness just hours after his running mate Mike Pence said they would accept the outcome.
"The election is absolutely being rigged by the dishonest and distorted media pushing crooked Hillary - but also at many polling places - SAD," Mr Trump wrote on Twitter, referring to Democratic candidate Hillary Clinton.
Earlier, Republican vice presidential candidate Mike Pence said in a TV interview on US show Face the Nation that Republicans would accept the result.
The latest attack by Mr Trump follows his accusations that Mrs Clinton took a performance-enhancing drug before their last presidential debate.
Speaking at a rally in New Hampshire, Mr Trump suggested that both candidates should take a drugs test before their final debate on Wednesday.
Trump suggests that he and Clinton should take a drugs test before their final debate on Wednesday https://t.co/jrDcndRj91 pic.twitter.com/ZIiC8VEROr
— RTÉ News (@rtenews) October 16, 2016
Meanwhile, three of Mrs Clinton's paid speeches to Goldman Sachs have been released by WikiLeaks, casting an awkward spotlight on the Democrat's ties to the biggest players on Wall Street in the final stretch of the White House race.
Mrs Clinton's campaign did not contest the authenticity of the remarks, which were part of a huge trove of documents hacked from the emails of campaign chairman John Podesta by WikiLeaks.
The campaign has blamed the Russian government for the hacks, a view shared by the US government, and accused the anti-secrecy website of seeking to help Mrs Clinton's Republican rival for the presidency.
Among other issues, Mrs Clinton is shown in the speeches offering opinions on financial regulations, relations with Russian President Vladimir Putin and the negative effects of previous WikiLeaks releases on US foreign policy.
Pence says evidence points to Russia in email hacks
Mr Pence said evidence implicates Russia in the email hacks tied to the US election, contradicting his running mate Mr Trump who cast doubt on Russia's involvement.
"I think there's no question that the evidence continues to point in that direction," Mr Pence said. "There should be severe consequences to Russia or any sovereign nation that is compromising the privacy or the security of the United States of America."
Mr Trump, who has been criticized for appearing too close to Russia after he publicly praised Mr Putin's strength, has questioned the reports of Moscow's involvement. During last week's second debate with Mrs Clinton he said, "Maybe there is no hacking".
However, Russian President Vladimir Putin said US claims that Russia had directed the cyber attacks sought to "distract" American voters from domestic problems.
"There are lots of problems (in the United States)," Mr Putin said in a televised press conference on the sidelines of the BRICS summit in India.
"And in these conditions, many resort to tried-and-tested methods to distract voters' attention from their own problems."
The Kremlin strongman accused US officials of portraying Russia as an "enemy" in order to "unite a country in the fight" against it.
"This card is being played actively," he said.
