States have both a constitutional and statutory right—if not an obligation—to remove aliens who are ineligible to vote in both federal and state elections from their voter registration rolls. The 90-day deadline for systematic removal programs applies only to removing eligible registrants who have changed their residence. It does not apply to aliens who were never eligible to register in the first place, just as it does not apply to minors, fictitious registrations, fraudulent registrations of any kind, decedents, felons, and mentally incompetent individuals. There is nothing in the National Voter Registration Act to the contrary.