Anthony Nel is the kind of voter who doesn't like to skip an election. The 29-year-old lives in the Dallas-Forth Worth area and usually votes early, which he did as recently as Texas' Nov. 4 constitutional election .

So he was disturbed last month to open a letter from his local election office in Denton County, calling into question whether he was eligible to vote at all.

"We have received information from the Texas Secretary of State reflecting that you might not be a United States citizen," read the notice .

The notice said he needed to provide proof of citizenship — such as a copy of a U.S. passport, birth certificate or naturalization certificate — within 30 days. Otherwise, his registration would be canceled, though it said he could be immediately reinstated if he showed that

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