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 TrumpSchiff urges GOP colleagues to share private concerns about Trump publicly US-China trade talks draw criticism for lack of women in pictures Overnight Defense: Trump to leave 200 troops in Syria | Trump, Kim plan one-on-one meeting | Pentagon asks DHS to justify moving funds for border wall MORE's former chief of staff Reince PriebusReinhold (Reince) Richard PriebusIs a presidential appointment worth the risk? Ex-White House aide says 'cartoon villain' Kellyanne Conway bad-mouthed colleagues Trump Org hires former WH ethics lawyer to deal with congressional probes MORE, as well as former press secretary Sean SpicerSean Michael SpicerSean Spicer joins 'Extra' as 'special DC correspondent' White House spokeswoman leaving to join PR firm Ex-White House aide Cliff Sims sues Trump MORE and current communications director Hope HicksHope Charlotte HicksWhite House spokeswoman leaving to join PR firm Hillicon Valley: House Intel panel will release Russia interviews | T-Mobile, Sprint step up merger push | DHS cyber office hosting webinars on China | Nest warns customers to shore up password security House Intel panel votes to release Russia interview transcripts to Mueller MORE.

Mueller announced charges against former Trump campaign chairman Paul ManafortPaul John ManafortWhite House braces for Mueller report Hillicon Valley: Trump pushes to speed up 5G rollout | Judge hits Roger Stone with full gag order | Google ends forced arbitration | Advertisers leave YouTube after report on pedophile ring Manafort to be sentenced for bank, tax fraud in Virginia on March 8 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.