Several current and former law enforcement officials said an Obama-era investigation found some evidence that Ms. Omar had entered into a sham marriage with a man suspected of being her brother.

© Tierney L. Cross/The New York Times

In the legal tangle between the Justice Department and California, a federal judge on Tuesday deferred a ruling but said the government already had a remedy it could use after the election.

© Philip Cheung for The New York Times

By a 2-1 vote, a federal appeals court panel denied the Trump administration’s request that it immediately order the state to set aside 20,000 mail-in ballots.

© Philip Cheung for The New York Times

Election officials across the state received letters from the agency saying if they fail to comply, they “risk significant federal scrutiny.”

© Philip Cheung for The New York Times