Tens of millions of voters have had their citizenship status and other information checked using a revamped tool offered by the Trump administration, even as many states — led by both Democrats and Republicans — are refusing or hesitating to use it because of outstanding questions about the system.

U.S. Citizenship and Immigration Services (USCIS) says election officials have used the tool to check the information of more than 33 million voters — a striking portion of the American public, considering little information has been made public about the tool's accuracy or data security.

The latest update to the system, known as SAVE, took effect Aug. 15 and allows election officials to use just the last four digits of voters' Social Security numbers — along with names and dates of birth — to

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