The walkout comes days after Zuckerberg announced Friday evening that Trump’s posts, which Twitter said broke its rules regarding “glorification of violence,” didn’t violate Facebook’s standards. Zuckerberg said he had a “visceral negative reaction” to Trump’s “inflammatory rhetoric,” but ultimately opted to leave the posts up untouched. Axios later reported that Zuckerberg had spoken to Trump on the phone before announcing the decision.

Zuckerberg announced Sunday night that Facebook would make a $10 million donation to “groups working on racial justice.” But the move doesn’t appear to have affected employees’ decision to walk out on Monday.

“We recognize the pain many of our people are feeling right now, especially our Black community,” a Facebook spokesperson said in a statement. “We encourage employees to speak openly when they disagree with leadership. As we face additional difficult decisions around content ahead, we’ll continue seeking their honest feedback.”

This isn’t the first time Facebook employees have clashed with Zuckerberg over the company’s treatment of Trump. Hundreds of employees signed an open letter last fall  that publicly criticized his decision to allow politicians to lie in advertisements.

But the latest controversy, which comes as Facebook employees have been working from home amid nationwide protests, appears to be escalating into a new territory. At least two “senior” employees have threatened to quit, NYT reports. Many other Facebook employees have publicly tweeted their disagreement.