The ruling largely blocked homeland security agents from carrying out field interviews in nine states, including California, as part of a sprawling effort to find noncitizens registered to vote.
Some lawmakers and commentators have turned their attention to the possibility that Republicans in Congress could try to block Democrats from assuming the majority.
State and local officials said that they received thousands of names lacking key identifying information, and that many of the names were paired with addresses over which they had no jurisdiction.
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