WikiLeaks founder Julian Assange has claimed Donald Trump 'won't be allowed to win' next week's election during an interview to be broadcast on a pro-Kremlin TV station.

The Australian computer hacker was speaking from inside the Ecuadorian embassy in London where he also accused Hillary Clinton of receiving donations from the same people funding ISIS.

Assange said he was basing his claims on emails released last month by WikiLeaks.

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WikiLeaks founder Julian Assange, pictured, claims next week's presidential election is fixed

He told veteran journalist John Pilger, pictured, the entire US establishment is backing Clinton

Speaking to Australian journalist John Pilger for Dartmouth Films, Assange claimed one of the leaked documents between showed a message sent by the then Secretary of State to John Podesta, who was an adviser to President Barack Obama.

Assange said the email urged Obama to 'bring pressure' on the governments of Saudi Arabia and Qatar, 'which are providing clandestine financial and logistic support to ISIL [ISIS] and other radical Sunni groups'.

He described the email as the 'most important' in the entire collection.

He claimed: 'All serious analysts know, and even the US government has agreed, that some Saudi figures have been supporting ISIS and funding ISIS, but the dodge has always been that it is some “rogue” princes using their oil money to do whatever they like, but actually the government disapproves. But that email says that it is the government of Saudi Arabia, and the government of Qatar that have been funding ISIS.'

Clinton has also been criticized over claims that the Clinton Foundation receives funding from Saudi and Qatari sources.

Assange, pictured, has been holed up in the Ecuadorian embassy in London since 2012

Assange claimed Donald Trump, pictured, will be defeated on Tuesday because the Washington elites would prefer an insider like Hillary Clinton inside the White House

Assange claimed big business, the banks and intelligence agencies are all behind Clinton

Later in the 25-minute interview, which will be broadcast on Russia Today, Assange claims next Tuesday's presidential election has been fixed in favour of Hillary Clinton.

He added: 'My analysis is that Trump would not be permitted to win. Why do I say that? Because he has had every establishment off his side. Trump does not have one establishment, maybe with the exception of the Evangelicals, if you can call them an establishment. Banks, intelligence, arms companies, foreign money, etc. are all united behind Hillary Clinton. And the media as well. Media owners, and the journalists themselves.'

Donald Trump has repeatedly said Tuesday's presidential election may be rigged, while providing scant evidence, and has urged supporters to keep an eye out for signs of voting fraud in Philadelphia and other heavily Democratic areas.

Democrats worry that could encourage Trump supporters to harass minority voters in a state that could determine whether Trump or his Democratic opponent, Hillary Clinton, wins the presidency. Voting-rights advocates said they are already receiving reports of harassment.

Democrats have launched a legal blitz of their own in an attempt to shut down Trump's poll-watching efforts in Pennsylvania and three other battleground states, arguing in lawsuits that Republican monitoring efforts amount to 'vigilante voter intimidation' that violates federal law.

Assange earlier denied he was a stooge for the Russian intelligence services, claiming they were not behind the damaging leaks to the Clinton campaign.

He has been wanted by Swedish authorities since 2010 over rape allegations.

He has been hiding the the Ecuadorian embassy in London over fears he will be extradited to the United States.

He said: ' The Clinton camp has been able to project a neo-McCarthyist hysteria that Russia is responsible for everything.

'Hillary Clinton has stated multiple times, falsely, that 17 US intelligence agencies had assessed that Russia was the source of our publications. That's false – we can say that the Russian government is not the source.'

The first tranche of emails published by WikiLeaks claimed the Democratic party leadership actively favored Clinton over her rival for the nomination Bernie Sanders.

The Department of Homeland Security Department and the Office of the Director of National Intelligence said last month they were 'confident' the Russian government was responsible for the leaks.

But Russia has denied this and presidential press secretary Dmitry Peskov said it was 'nonsense'.