Mayor Rahm Emanuel and City Clerk Anna Valencia have already been accused of “suborning voter fraud” by allowing Chicago’s CityKey municipal identification card to be used to register to vote.

Now, the 2019 running mates have another problem on their hands: a rival bidder’s politically explosive claim that printing technology used to create the new ID compromises personal information the city has promised to keep confidential to shield illegal immigrants from the threat of deportation.