Election officials say they worry the administration could use its own unsubstantiated claims to contest the vote in November.

© Doug Mills/The New York Times

But about half expressed concerns that Republicans could try to overturn the results, a New York Times/Siena poll found.

© Allison Robbert/Associated Press

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.

© Philip Cheung for The New York Times