Sens. Jacky Rosen (D-NV) and James Lankford (R-OK) wrote to Meta CEO Mark Zuckerberg on Tuesday pressing him over the company’s failures to address antisemitic bot accounts on its platforms, urging Facebook and Instagram to label posts and users by their country of origin as a particularly important reform.

“We write to express grave concerns regarding the persistent problem of inauthentic accounts and ‘bot farm’ operations abusing social media platforms to develop and spread antisemitic content on your platforms,” Rosen and Lankford, who together chair the Senate antisemitism task force, said in a statement.

They also requested that Zuckerberg share information about what safeguards Meta has in place to “prevent platform abuse by inauthentic accounts” on Instagram and Facebook and that the company take steps to “implement reforms to protect users, limit the proliferation of antisemitic content, and strengthen its transparency measures against inauthentic behavior, including by labeling accounts’ country of origin for the American public.”

Rosen and Lankford said that Meta “cannot continue to play catch up” against coordinated campaigns on social media, and that lawmakers need “collaboration” with social media companies to ensure greater transparency and integrity.

The senators asked Zuckerberg to provide more information on how Meta is preventing inauthentic accounts spreading antisemitic contenting from being monetized; how it takes action against inauthentic accounts “at scale”; how it handles non-English antisemitic bot networks; how it prevents those whose accounts have been shut down from establishing new ones; and how it addresses accounts with “unverifiable or inconsistent geolocation patterns.”

The lawmakers highlighted what they characterized as a growing problem of foreign actors using fake accounts to promote division in America, including through “open, hostile, and violent antisemitism.” They said that this problem is only likely to increase with the expansion of artificial intelligence, which can overwhelm current safeguards.

They noted that data indicates that more than 1.1 billion accounts on Facebook have already been sanctioned for inauthentic behavior.

“Analysis of online antisemitism across platforms shows that coordinated antisemitic narratives are often amplified by clusters of accounts with disguised locations,” Rosen and Lankford said. “In reality, many of these accounts operate across borders and outside of the American communities they target, making their activity difficult to trace or disrupt without reliable location signals.”

The senators emphasized that “glorification of harm” and calls for attacks on Jewish communities “have been particularly pronounced following political violence on American soil” and that antisemitic posts can quickly reach audiences of millions online.