The Public Interest Legal Foundation, an Indiana-based nonprofit that litigates to protect election integrity, released a report on Tuesday detailing voter rolls in Philadelphia. The information was collected from public records requests made through the National Voter Registration Act.

The group found that from 2013 to 2015, 86 registrations were cancelled in Philadelphia because the registrant was not a United States citizen. Of the cancelled registrants, 40 aliens from the city have voted in at least one election, the report stated.

“The report only details aliens who requested to be removed from the rolls,” PILF said. “No procedure exists to systematically scan voter rolls to detect aliens and election officials do not use data from the federal SAVE (Systematic Alien Verification for Entitlements) database to scan for illegal registrations by non-citizens.”