“Even small changes such as moving into an apartment building, moving down the block, or changing party affiliation are considered voter registration updates. Under the SAVE Act, Americans would have to go in person to their election office and present original or certified documentation to make any voter registration change.
This would make civic participation much more difficult for tens of millions of citizens every election cycle and would outright disenfranchise millions more. The policies of the SAVE Act would also be in addition to state voter ID laws that require voters to show identification at the polls
…
The Safeguard American Voter Eligibility (SAVE) Act would require all American citizens registering to vote or updating their registration information to present documentary proof of citizenship in person. For the vast majority of Americans, this would be a passport or birth certificate.”
https://www.americanprogress.org/article/the-save-act-overview-and-facts