An affiliation of union, minority and civil rights groups asked a federal judge Monday to stop the state from going forward with its latest voter purge targeting noncitizens.

Attorneys for the groups as well as individual members told U.S. District Judge William Zloch that purging the voter rolls within 90 days of the election violates the National Voter Registration Act on 1993 and would cast a chill over the Nov. 6 presidential election.