Facebook COO Sheryl Sandberg announced at an event last night that Facebook will be requiring political bias training for employees, according to a report from The Hill.

According to the report, Sandberg told a crowd that the company has already held classes "focused on racial bias, age bias, gender bias, national bias — and we’re going to add in a scenario now on political bias." The Hill also reports that the training will be mandatory for all employees.

Facebook is still fending off fallout from a Gizmodo report last month suggesting political bias in the company's Trending Topics operation. A former employee told the site that conservative-focused news was suppressed on the platform.

To mitigate the damage, Mark Zuckerberg organized meetings with prominent conservatives. Notably, Sandberg gave last night's talk at an event organized by a conservative think tank: the American Enterprise Institute.