County Judge Clay Jenkins and commissioners Theresa Daniel and John Wiley Price, all Democrats, voted for the measure. Democrat Elba Garcia and Republican Mike Cantrell voted against joining the suit.
Garcia voiced concerns about the cost, and Cantrell said the county shouldn't use county funds for a partisan fight.
The Justice Department sued Texas in 2011, alleging the law discriminated against minority voters. The ID law wasn't enforced due to conflicts with the U.S. Voting Rights Act. When the U.S. Supreme Court struck down parts of the act earlier this year, the state reinstated the law.
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