The U.S. Supreme Court has revived for now a federal data system the Department of Homeland Security revamped into a tool to check the citizenship of millions of Americans on voter rolls. The tool has mistakenly flagged some eligible voters as potential noncitizens.

The news comes as the Trump administration has been pouring resources into searching for noncitizens on voter rolls ahead of the upcoming election. The Supreme Court's decision opens the way for the administration to use its expanded version of the Systematic Alien Verification for Entitlements data system — known as SAVE — in that hunt, as well as in its unprecedented project of compiling lists of adult citizens in each state.

SAVE is a 40-year-old federal data system that was created to check the immigration status of noncitizens to determine their eligibility for public benefits. Then, DHS overhauled SAVE last year by linking it for the first time with Social Security Administration records, which include most Americans. The overhaul also allowed bulk queries to SAVE, and DHS encouraged states to upload their entire voter rolls to SAVE to verify those registered are U.S. citizens and not listed as deceased in federal records.

Another source:

Supreme Court lets Trump admin use revamped federal voter eligibility database

The court’s order puts on hold a federal judge’s June ruling that had deemed the Republican administration’s recently revamped version of SAVE illegal.