Special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's office has reportedly requested information from Cambridge Analytica, the data firm utilized by the Trump campaign during the 2016 presidential race.

The Wall Street Journal reports that Mueller's team has requested all emails from employees at the firm who worked with the campaign.

The request, which wasn't previously known, was voluntary, as was another request the firm complied with from the House Intelligence Committee, the newspaper reported.

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Cambridge Analytica CEO Alexander Nix also interviewed with the House Intelligence Committee over video call this week, according to the report.

Nix was reported earlier this year to have been in contact with top Trump donor Rebekah Mercer about better organizing emails being released by WikiLeaks.

WikiLeaks founder Julian Assange tweeted that he could confirm that he was contacted by Nix prior to November 2016 and that Nix's request was declined.

It was reported that Nix was interested in obtaining the 33,000 emails deleted from Clinton's private server used during her time leading the State Department.

"I can confirm an approach by Cambridge Analytica [prior to November last year] and can confirm that it was rejected by WikiLeaks," Assange tweeted.

Mueller's investigation entered a new phase last month when former national security adviser Michael Flynn pleaded guilty to lying to the FBI about his contacts with the Russians and promised to cooperate with Mueller's probe.

In October, former Trump campaign chairman Paul Manafort and his business associate Richard Gates were also indicted in Mueller's probe under charges of tax fraud and money laundering related to work the pair did for a pro-Russia political party in Ukraine.