Hillary Clinton's campaign manager Robby Mook pointed to media reports when asked for evidence that Russia was behind the embarrassing Democratic National Committee email hack.

'It's a theory that is being put forward now by CNN, by the Washington Post, by the New York Times, these are the experts speaking out on this,' Mook told the Today show's Savannah Guthrie who brought up that Republican Donald Trump has called these accusations a 'conspiracy theory.'

Mook noted that CNN had reported yesterday that the FBI is investigating the DNC hack, but admitted that no government official had confirmed the connection to the Clinton campaign.

'They have not communicated that to us,' Mook said. 'I am simply going off what the reporting is telling us.'

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Hillary Clinton's campaign manager Robby Mook said the campaign has been looking to media reports to make the connection between Russian hackers and the Democratic National Committee leak

Robby Mook (left) was asked by NBC News' Savannah Guthrie (right) to provide evidence that the connection between Russian hackers and the DNC leak isn't a 'conspiracy theory' like Donald Trump said.

'If the reporting is accurate this is something very troubling, the idea that a foreign state could be trying to influence our electoral process, influence who becomes our president of the United States,' Mook said.

'That's a very serious situation,' he added.

Thousands of emails were leaked to Wikileaks Friday, likely courtesy of a hacker who refers to himself as 'Guccifer 2.0,' who says he's not Russian and is a solo actor.

However, Crowdstrike, the DNC's cybersecurity firm, noted back on June 14 that analysts had discovered that two separate Russian intelligence groups had gained access to the DNC's networks.

When Guccifer 2.0 took credit for the hack, Crowdstrike stood by its analysis writing, 'these claims do nothing to lessen our findings relating to the Russian government's involvement, portions of which we have documented for the public and greater security community.'

Other security firms backed Crowdstrike's assessment up.

An NBC News analysis pointed to five reasons why the Russians are likely the culprits including geography – they took a Russian holiday off – and language, with traces of the a Cyrillic found in their work.

NBC pointed to the forensic evidence found by Crowdstrike that fingers two groups, COZY BEAR and FANCY BEAR for the hack, known proxies of the Russian government.

'We've had lots of experience with both of these actors .. .and know them well,' said the initial Crowdstrike assessment.

There's also motive and precedent at play.

'Given their mutual and very public bromance, Putin would much prefer a Trump presidency to a Clinton one, and the timing suggests the leak was time for maximum embarrassment to the Democrats and their presumptive nominee,' argued NBC News' Josh Meyer.

In the past the Director of National Intelligence James Clapper said there's been evidence of foreign hackers spying on presidential candidates in the United States.

In was Mook on Sunday who loudly played up the connection between the Russians and the embarrassing DNC hack, which made it look like party leaders tipped the scale in favor of Clinton over her rival, Vermont Sen. Bernie Sanders.

'I don't think it's coincidental that these emails were released on the eve of our convention here,' Mook said. 'And I think it's disturbing.'

Democrats doubled down on this link yesterday, after their party leader, Rep. Debbie Wasserman Schultz, had resigned from her party post and then decided she wouldn't even touch the convention's gavel – all within 24 hours.

Referencing media reports, but more vaguely, Mook said, 'All we know right now is what experts are telling us.'

'What the experts are saying and what the experts said when this breach initially happened at the DNC was that they believed that it was Russian state actors who took these emails,' Mook said.

'And what further experts are saying, is that then because they possessed those emails, that Russian state actors were feeding the emails to ... hackers for the purpose of helping Donald Trump.'

Mook originally made this connection on Sunday, speaking to Jake Tapper on CNN's State of the Union.