From the press release this past Thursday:

U.S. Citizenship and Immigration Services updated the Systematic Alien Verification for Entitlements (SAVE) program to ensure a single, reliable source for verifying immigration status and U.S. citizenship nationwide. State and local authorities can input Social Security numbers to help verify U.S. citizenship and prevent aliens from voting in American elections. 

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This new partnership with the Social Security Administration allows cases to verify citizenship or immigration status to be created using Social Security numbers rather than a DHS identifying number, which most state and local agencies do not collect. Also, for the first time, agencies can submit more than one case at a time, making the process more efficient.

Sure seems like this new capacity required — prior to rollout — an update to the “system of records notice” (usually known as a SORN) that governs federal agency records on individuals under the Privacy Act of 1974, and an opportunity for comment.  And I haven’t seen one relevant to this change yet.