The Trump administration is escalating its fight with California ahead of next month's midterm election, warning that local officials who process and tabulate ballots submitted by suspected noncitizen voters are putting themselves at risk of criminal investigation and potential prosecution.

The Trump administration sued California election officials Thursday, asking a judge to bar the state from counting mail-in ballots for next month's midterm elections from people the federal government has identified as "likely" noncitizens until their status can be confirmed.