CHICAGO — Republican Gov. Bruce Rauner has signed a plan limiting the role local and state police in Illinois can play in cooperating with federal immigration authorities.

The Trust Act prohibits police from searching, arresting or detaining someone solely because of immigration status, or because of so-called federal immigration detainers. But local authorities would be able to hold someone if federal officials have a valid criminal warrant.

The law signed Monday takes effect immediately. It’s backed by law enforcement, business and immigrant groups.

It was scaled back from a wider proposal calling for the creation of “safe zones” where immigration agents couldn’t make arrests.

Proponents don’t call it a “sanctuary” bill. But some Republicans who oppose it characterize it that way, which comes as President Donald Trump has threatened so-called sanctuary cities such as Chicago.