How is that relevant to timmy's claim that citizens can sue the police "if they're not diligent enough in prosecuting illegal aliens?" Oh yeah, I forgot that timmy can't read. There is no right to sue if police aren't diligent enough in prosecuting illegal aliens. As it clearly states, there is a cause of action if an agency or official "adopts or implements a policy or practice that limits or restricts the enforcement of federal immigration laws to less than the full extent permitted by federal law." In other words, people can sue a municipality if it refuses to enforce the law. I don't see a problem with that. If some liberal town council decides it's not going to let its police department enforce the law they should be sued.
Is the police an agency? Is a police officer an official? (Questions not claims)
I think police/sheriff's departments would qualify as agencies and sheriffs & chiefs of police would be officials. Rather than the law enforcement agencies/officials, I think it's more likely targeted at local politicians who'd try to stop their local police departments from enforcing the law. The law specifically protects individual police officers from liability: "a law enforcement officer is indemnified by the law enforcement officer's agency against reasonable costs and expenses, including attorney fees, incurred by the officer in connection with any action, suit or proceeding brought pursuant to this section in which the officer may be a defendant by reason of the officer being or having been a member of the law enforcement agency."
This might be a biased summary and not the law, but are you referring to this?Section 2-I: Indemnifies police officers against costs and attorneys’ fees incurred in connection with any litigation brought by citizens and residents who were wrongfully detained, questioned, arrested, or transported, unless the officer was acting in bad faith.
Assuming this is fair and accurate, and what you mean then protecting an officer who violates someones right living up to the requirements of this law is not the same as protecting an officer who uses his discretion and doesn't pursue someones status to the fullest extent of law, does it?