Craig Murray, the former UK ambassador to Uzbekistan, who is a close associate of WikiLeaks editor Julian Assange, has dismissed the CIA's claims that Russia interfered in last month’s presidential election as "bulls***".
On Friday the Washington Post reported on a secret assessment by the CIA, which concluded that Russian intelligence hacked the Democratic National Committee's servers and that of Hillary Clinton's campaign chairman John Podesta, specifically to help Trump win the presidency.
Mr Murray said: "I know who leaked them. I’ve met the person who leaked them, and they are certainly not Russian and it’s an insider. It’s a leak, not a hack; the two are different things.
“If what the CIA are saying is true, and the CIA’s statement refers to people who are known to be linked to the Russian state, they would have arrested someone if it was someone inside the United States.
“America has not been shy about arresting whistleblowers and it’s not been shy about extraditing hackers. They plainly have no knowledge whatsoever.”
The Kremlin has rejected the hacking accusations while Julian Assange has previously said the DNC leaks were not linked to Russia.
The claims also drew a rebuke from Trump’s transition team, which said in a statement: "These are the same people that said Saddam Hussein had weapons of mass destruction."
Meanwhile US President-elect Donald Trump called the CIA's assessment "ridiculous".
“Can you imagine if the election results were the opposite and WE tried to play the Russia/CIA card. It would be called conspiracy theory!” Trump tweeted on Monday morning.
Can you imagine if the election results were the opposite and WE tried to play the Russia/CIA card. It would be called conspiracy theory!— Donald J. Trump (@realDonaldTrump) December 12, 2016
Mr Trump rejected the CIA's conclusion that Russia tried to interfere with the presidential election and blamed "very embarrassed" Democrats for the public release of the assessment. The Washington Post first reported the CIA finding on Friday.
"It's ridiculous," Mr Trump said of the CIA's assessment. He added, however, that he does not necessarily oppose President Barack Obama's order for a review of campaign-season hacking. "If you're going to do that, I think you should not just say 'Russia'. You should say other countries also, and maybe other individuals."
The White House has said the probe would focus on any breaches by other countries, and past elections.
The Office of the Director of National Intelligence (ODNI), which oversees the 17 agency-strong US intelligence community, has not embraced the CIA's assessment, sources have told Reuters.
The Federal Bureau of Investigation, whose standards require it to make cases that can stand up in court, also declined to accept the CIA's analysis.
In an angry letter sent to ODNI chief James Clapper on Monday, House Intelligence Committee Chairman Devin Nunes said he was “dismayed” that the top US intelligence official had not informed the panel of the CIA's analysis and the difference between its judgment and the FBI’s assessment, Reuters reported.
"ODNI is not arguing that the agency (CIA) is wrong, only that they can't prove intent," one of the officials told the news agency. "Of course they can't, absent agents in on the decision-making in Moscow.”
The ODNI was formed after the 9/11 terrorist attacks.