the rule change, as requested by the department, would allow judges to grant warrants for remote searches of computers located outside their district or when the location is unknown.

The government has defended the maneuver as a necessary update of protocol intended to modernize criminal procedure to address the increasingly complex digital realities of the 21st century. The FBI wants the expanded authority, which would allow it to more easily infiltrate computer networks to install malicious tracking software. This way, investigators can better monitor suspected criminals who use technology to conceal their identity.

But the plan has been widely opposed by privacy advocates, such as the American Civil Liberties Union, as well as some technologists, who say it amounts to a substantial rewriting of the rule and not just a procedural tweak. Such a change could threaten the Fourth Amendment’s protections against unreasonable search and seizures, they warn, and possibly allow the FBI to violate the sovereignty of foreign nations. The rule change also could let the agency simultaneously target millions of computers at once, even potentially those belonging to users who aren’t suspected of any wrongdoing.