WikiLeaks founder Julian Assange told Fox News in an interview set to air Tuesday that hacked emails from the Democratic National Committee and Hillary Clinton's campaign chairman did not come from a Russian state source.

A USA intelligence report on the hacking was scheduled to be presented to Obama on Thursday and to Trump on Friday, though its contents were still under discussion on Wednesday, officials said.

WASHINGTON-President-elect Donald Trump on Friday acknowledged for the first time that Russian Federation is among actors that try to hack USA government and political institutions, but insisted cyberattacks didn't affect the outcome of last year's election. The report alleged Putin's government sought to "undermine public faith in the USA democratic process, denigrate Secretary Clinton, and harm her electability and potential presidency". He said multiple motives will be detailed in a comprehensive report to be made public next week.

The meeting at Trump Tower involved National Intelligence Director Gen James Clapper, CIA Director John Brennan and FBI Director James Comey.

The celebrations were reportedly discovered in communications intercepted by USA intelligence officials.

The Associated Press reported that intelligence officials said there was no change to Trump's briefing schedule.

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"We did not make an assessment of the impact that Russian activities had on the outcome of the 2016 election", the report said.

Obama took public action on the issue only after Trump was elected and began disparaging the intelligence community's reporting on the Russian hacking, another official said.

"How did NBC get 'an exclusive look into the top secret report he (Obama) was presented?' Who gave them this report and why?"

Other levels of "government, organizations, associations, or businesses" also need to strengthen efforts to protect themselves against hacking, he said.

Senior Russian officials celebrated Donald Trump's win in the November presidential election, according to a classified intelligence report delivered Thursday to President Obama. Announcing the U.S. retaliatory measures against Russia, Obama had said, "All Americans should be alarmed by Russia's actions".

But he meanwhile rankled officials in both political parties and angered the intelligence community by his choice of Assange as a reference for his views. The US president-elect Trump would also get the report in NY. As of late Friday, Trump's transition team had not responded to a Yahoo News request to explain the discrepancy between what Trump and the intelligence assessment said.