Prince William County could adopt some of the toughest measures in the nation targeting illegal immigrants.

The resolution is scheduled for a vote on Tuesday. It would require police to check the residency status of anyone suspected of breaking the law. And it would require schools, libraries and even swimming pools to verify the immigration status for anyone using county services.

The schools issue could raise a legal challenge because courts have upheld the right of undocumented immigrants to a public education.

Most of the eight Prince William supervisors have said they plan to support the resolution. But changes could still be made.

Supervisor John Stirrup says the goal is to deny services to illegal immigrants, including most medical care.

Kathleen Walker, president of the American Immigration Lawyers Association, says the measures would be "extremely harsh."