Facebook founder Mark Zuckerberg expressed regret over the attacks a conservative public relations firm — hired by Facebook — lobbed against billionaire liberal philanthropist George Soros.

During an interview with CNN, Zuckerberg uncomfortably addressed a variety of allegations against his social media network that were laid our in a recent New York Times story about Facebook’s internal handling of a series of crises related to the Cambridge Analytica data breach and Russian meddling in the 2016 election. The Times report revealed that Facebook at one point hired a consulting firm that placed the blame for a supposed anti-Facebook movement on Soros, a longtime, frequent target of conservative groups.

This week, Zuckerberg acknowledged the attacks went too far.

“I don’t think that this is the type of thing that our company should be engaging with,” he said. “I know that George Soros has been the target of a lot of really horrendous attacks and I think that that is terrible. And I certainly wouldn’t want anyone who is associated with our company to be part of that.”

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