Federal officials have expanded inquiries into nonprofits accused of signing up noncitizens to vote.
The investigations target voter registration groups operating across several states, according to government documents.
Agencies claim these organizations may have enrolled people who are not eligible to cast ballots.
However, noncitizen voting in U.S. elections remains extremely rare, with no evidence of widespread fraud.
The probes follow long-standing claims by former President Trump about illegal voting in the 2020 election.
Election experts say such cases are isolated and typically caught by existing safeguards.
The inquiries have raised concerns among civil rights groups about voter intimidation.
Nonprofits named in the documents deny any wrongdoing and say they follow all laws.
Federal law already prohibits noncitizens from voting in national elections, with severe penalties.
Local election officials report that verification systems flag ineligible registrations before ballots are cast.
The administration has not released public evidence linking the groups to any criminal scheme.
Legal analysts note that investigating registration drives is lawful but can chill outreach efforts.
The groups involved say they are cooperating with authorities while continuing their work.
