Another "Don't Ask, Don't Tell" Rule

Buried in the predictable sob-story about an illegal immigrant in Chicago about to be deported is this little gem:

The state [Illinois] says its employees are prohibited by federal law from seeking confirmation of citizenship before registering people to vote.
Yep, you read that right. It is illegal for officials to ask if you're eligible to vote before signing you up to vote.

Am I the only one that sees a problem there?