A second former Cambridge Analytica employee has reportedly been subpoenaed by Robert Mueller's investigation

A second former employee of the now-defunct data-analysis firm Cambridge Analytica has been subpoenaed by special counsel Robert Mueller's investigation into possible collusion between President Donald Trump's presidential campaign and the Russian government, The Guardian reports.A representative for Brittany Kaiser, a former business development director for Cambridge Analytica, told The Guardian that Kaiser has been subpoenaed by Mueller and will offer her full cooperation to his investigation. Cambridge Analytica worked for President Trump's 2016 campaign to help it target ads to potential voters. The company attracted public scrutiny after Facebook banned it from its platform for mishandling user data.A second former employee of the now-defunct data-analysis firm Cambridge Analytica has been subpoenaed by special counsel Robert Mueller's investigation into possible collusion between President Donald Trump's presidential campaign and the Russian government, The Guardian reports.A representative for Brittany Kaiser, a former business development director for Cambridge Analytica, told The Guardian that Kaiser has been subpoenaed by Mueller and will offer her full cooperation to his investigation. The representative also told the publication that Kaiser is participating in other investigations from the US government concerning Cambridge Analytica.Read more: Here's everyone who has been charged and convicted in Mueller's Russia probe so farKaiser's subpoena was first revealed in an upcoming Netflix documentary, “The Great Hack,” in which Kaiser reportedly says she received the subpoena after The Guardian reported in June 2018 that she met with WikiLeaks founder Julian Assange in February 2017. At the time of the meeting, Kaiser was a Cambridge Analytica employee.Sam Patten was the first Cambridge Analytica employee to receive a subpoena from Mueller. Patten pleaded guilty in 2018 to one count of failing to register as a foreign agent in the District of Columbia after he had received over $1 million working as a lobbyist for Ukraine between 2014 and 2018. Cambridge Analytica worked for President Trump's 2016 campaign to help it target ads to potential voters. The company attracted public scrutiny after Facebook banned it from its platform for mishandling user data. Facebook said Cambridge Analytica may have received leaked data from up to 87 million users, and Cambridge Analytica ceased operations in 2018.Mueller's investigation into Russian interference in the 2016 US presidential election has resulted in charges against eight Americans associated with Trump's campaign or administration, as well as three Russian companies, 13 Russian nationals, 12 Russian intelligence officers, and two people with no relationship to Trump or Russia.Speculation has suggested that Mueller is close to finishing his final report, though questions remain over whether it will be released to the public.