This is why there is a period where it is not allowed within 90 days of the election.
More than 1,600 Virginians have had their voter registrations canceled since August under a state program that the Justice Department and advocacy groups contend is illegal.
apnews.com
A similar lawsuit was filed in Alabama, and a federal judge there last week ordered the state to restore eligibility for more than 3,200 voters who had been deemed ineligible noncitizens.
Testimony from state officials in that case showed that roughly 2,000 of the 3,251 voters who were made inactive were actually legally registered citizens.