Facebook employees are so upset with CEO Mark Zuckerberg’s decision to take no action on President Donald Trump’s posts that they participated in a “virtual walkout” Monday in a show of protest against the company, The New York Times reports.

Facebook workers, most of whom are still working from home, gave themselves the day off Monday and indicated in out-of-office messages that they were “out of the office in a show of protest,” according to the report. NYT is also reporting that employees are also working on a “list of demands for management.”

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Mark Zuckerberg announced on Friday evening that the president’s “when the looting starts, the shooting starts” comments made last week didn’t violate Facebook standards. Zuckerberg said he had a “visceral negative reaction” to Trump’s “inflammatory rhetoric,” but ultimately opted to leave the posts up on his platform. Axios later reported that Zuckerberg had spoken to Trump on the phone before announcing the decision.

Zuckerberg announced Sunday that Facebook would make a $10 million donation to “groups working on social justice,” but the move didn’t appear to have affected the employees’ decision to stage the Monday walkout. As many as 600 employees participated in the virtual protest, estimated one employee who spoke with CNBC. To address the situation, Zuckerberg plans to hold a town hall with employees on Tuesday, the employee said.

The CEO’s employees have previously clashed with him on the issue of free speech. Last fall, hundreds of employees signed an open letter that publicly criticized his decisions to allow politicians to “lie” in advertisements. The latest controversy, however, appears to be escalating into new territory. At least two “senior” employees have threatened to quit, NYT reports. Many other Facebook employees took to Twitter to publicly air their disagreement.

Although employee activism has been common around Silicon Valley in recent years, the public outcry is unusual for Facebook employees, who have typically kept their disagreements in-house over the past several years of scandal. The events of the last few days, however, pushed the company debates into public view.