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 has subpoenaed a former employee of data firm Cambridge Analytica, a spokesperson for the employee told The Guardian.

The ex-employee, Brittany Kaiser, is cooperating fully with Mueller's investigation into Russian interference in the 2016 election, the spokesperson added. Kaiser is also cooperating with congressional and other legal investigations into the actions of Cambridge Analytica.

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Cambridge Analytica shut down last year after becoming embroiled in controversy for improperly obtaining data on tens of millions of Facebook users.

Kaiser says that the subpoena came after The Guardian reported last year that she met in 2017 with WikiLeaks founder Julian Assange while she was still working for Cambridge Analytica, according to the newspaper. WikiLeaks is a focus of Mueller's probe because it released hacked Democratic emails ahead of the 2016 election.

The special counsel has also previously probed the ties between Cambridge Analytica and the Trump campaign.

In a case stemming from Mueller's probe, federal prosecutors have already charged Sam Patten, another former employee of the firm and an ex-associate of Paul Manafort.

Patten pleaded guilty last year to illegal foreign lobbying after he was charged with failing to register as a foreign agent for Ukraine's Opposition Bloc. Patten, who agreed to cooperate with the special counsel, is scheduled to be sentenced in April.