Sen. Josh Hawley (R-MO) is urging the Justice Department to open a formal investigation into what he describes as well-funded and professionally coordinated anti-Immigration and Customs Enforcement demonstrations that he says are posing public safety and national security risks.

In a letter to Attorney General Pam Bondi on Tuesday, Hawley argued that recent protests against federal immigration enforcement aren’t spontaneous or decentralized, but reflect “a coordinated national operation” backed by opaque funding networks, nonprofit organizations, and “short-lived ‘grassroots’ fronts” designed to obscure donor identities.