Nineteen House Republicans have asked New Jersey Governor Mikie Sherrill to explain reports that about 6,600 noncitizens were registered to vote because of an alleged software error. The lawmakers say the issue requires accountability and safeguards, while Democratic officials have said it does not demonstrate widespread election fraud.

The registrations were reportedly linked to errors in the state’s voter-registration system over many years, rather than evidence that the affected people voted. Republicans are seeking details on when officials discovered the problem, how it was corrected and whether any improper ballots were cast, amid continuing national disputes over election security and noncitizen voting.