Michael Morley for Jurist:

In short, requiring applicants to provide proof-of-citizenship is a common-sense backstop to help prevent the types of routine errors that inevitably arise when millions of people are filling out a particular form. In that sense, a proof-of-citizenship requirement is “necessary to enable the appropriate State election official to assess the eligibility of the applicant.” Newby (Brian) got it right; Newby (DC Circuit) got it wrong.