The Department of Homeland Security is formalizing a policy to search the social media accounts of all foreign applicants for U.S. visas or other benefits, according to a memo issued Wednesday morning.

U.S. Citizenship and Immigration Services will collect applicants’ social media handles and scour their accounts for any “antisemitic activity.” Social media content “endorsing, espousing or promoting antisemitic terrorism, antisemitic terrorist organizations, or other antisemitic terrorist activity” is now “grounds for denying immigration benefit requests.”

“This will immediately affect aliens applying for permanent resident status, foreign students and aliens affiliated with educational institutions linked to antisemitic activity,” the memo continued.

Secretary of State Marco Rubio proposed the policy last month, drawing criticism from free speech advocates. Others objected to the broad scope of the proposal, which included not just visa applicants but also current residents and green card holders. The new policy is just as broad.

The news comes after weeks of escalating attacks on international students, many of whom have had their visas and legal resident status revoked for pro-Palestinian speech under an obscure legal clause that allows the secretary of state to determine if a visa holder is a “foreign policy threat.” An Axios report found that the State Department was already using artificial intelligence to scan student visa holders’ social media accounts looking for the allegedly antisemitic speech referenced in the new memo.

Many more students have had their visas revoked over minor criminal infractions; others have no clear understanding why their status was terminated.

An Inside Higher Ed analysis found that nearly 450 students have had their visas revoked as of Wednesday afternoon. Follow along with our interactive map and tracker.