In court testimony, the agent outlined the willingness of Kash Patel, the F.B.I. director, to take orders from President Trump to investigate his perceived enemies.
President Trump, who has continued to falsely claim that he won the 2020 election, has been relentless in his efforts to sow doubts about the integrity of American voting.
The midterms are the first elections in which artificial intelligence is integrated into every major social media platform. Efforts to blunt its harms are uneven.
One in five voters plans to use A.I. to look into a race on their ballot, according a survey released this month by the American Association of Political Consultants.