The department has issued grand jury subpoenas to local election officials as part of a widening effort to prove unsubstantiated claims about large numbers of illegal voters in the state.
Voters casting their ballots in Los Angeles in June. At least two employees of Los Angeles County Registrar-Recorder’s office received grand jury subpoenas last week.
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.
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.
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.