Mueller team questioning RNC staffers on 2016 digital operation: report

Special counsel Robert Mueller's team has started the process of questioning various Republican National Committee (RNC) staffers about the party's digital apparatus that worked with the Trump campaign during the 2016 presidential campaign, Yahoo News reported Wednesday.

Mueller's team is reportedly looking into the joint effort from the party and the campaign to reach out to voters in key swing states.

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Sources told the news organization that Mueller is seeking to determine whether the effort was related to efforts from Russian trolls and bots to influence American voters.

The special counsel's office declined to comment.

The report comes as Mueller's probe moves closer to the White House.

Mueller has questioned President TrumpDonald John TrumpHow to stand out in the crowd: Kirsten Gillibrand needs to find her niche Countdown clock is on for Mueller conclusions Omar: White supremacist attacks are rising because Trump publicly says 'Islam hates us' MORE's former chief of staff Reince PriebusReinhold (Reince) Richard PriebusMulvaney poised to become permanent White House chief of staff: report DNC decision to shut out Fox News hurts Democratic candidates and Americans The five Trump communications directors who have come and gone MORE, as well as former press secretary Sean SpicerSean Michael SpicerFive things we know about Dems' sprawling Trump probe The five Trump communications directors who have come and gone New York state officials subpoena Trump Org's longtime insurance broker MORE and current communications director Hope HicksHope Charlotte HicksFive things we know about Dems' sprawling Trump probe Swalwell on Hicks testimony: 'She's going to have to tell us who she lied for' in Trump admin Former White House staffer Hope Hicks to cooperate with Dems' probe into Trump MORE.

Mueller announced charges against former Trump campaign chairman Paul ManafortPaul John ManafortFox's Chris Wallace challenges Nadler on whether no more indictments means no 'criminal collusion' Nadler willing to go to Supreme Court to obtain Mueller report End of Mueller probe a boost for Trump, a warning for Democrats MORE and his business associate Richard Gates in October.

Trump's ousted national security adviser Michael Flynn pleaded guilty to lying to the FBI about his foreign contacts earlier this month and is said to be cooperating with Mueller's investigation.

- This story was updated at 1 p.m.