Even if opponents don't succeed in getting the requirement put on hold, some backers of the law are questioning the level of cooperation they will get from federal immigration authorities, who will be called to verify people's immigration status and be responsible for picking up illegal immigrants from local officers.
Federal immigration officers have said they will help, but only if doing so conforms to their priorities, including catching repeat violators and identifying and removing those who threaten public safety and national security.
If federal agents decline to pick up illegal immigrants, local officers in some cases will likely have to let them go unless they're suspected of committing a crime that would require them to be brought to jail.
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