Facebook CEO Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield Facebook to 'restrict the circulation of content' if chaos results from election: report 2.5 million US users register to vote using Facebook, Instagram, Messenger MORE reportedly told Sheryl Sandberg, the company’s chief operating officer, that he blamed her for the backlash following revelations of the Cambridge Analytica scandal earlier this year.

The Wall Street Journal on Monday reported the internal strife between top two Facebook executives. After Zuckerberg blamed her for the fallout this spring, Sandberg told friends that she was worried about losing her job.

The Journal also reported that Zuckerberg later expressed approval of Sandberg’s response to the backlash over the privacy scandal, which Zuckerberg referred to as “hysteria.”

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The new details are emerging as the two executives are struggling to respond to a New York Times report detailing Facebook’s tactics in Washington following the scandal. The fallout from Cambridge Analytica prompted lawmakers to go after the company over Russian disinformation campaigns on the platform.

On a call last week with reporters, Zuckerberg said that Sandberg is a “very important partner to me, and continues to be, and will continue to be.”

A Facebook spokesman said in a statement to The Hill, “We were absolutely too slow to identify a range of issues over the past two years, but once we did we took strong action to address them and prevent future abuse. We’ve made massive investments in safety and security. While we know we have more work to do, we believe we’ve made progress.”

The company is facing new scrutiny from Congress and a backlash from advertisers following the latest revelations. Facebook’s stock was down nearly 5 percent Monday morning.