The city of Chicago has come out swinging against Purdue Pharma L.P.’s motion to disqualify the city’s lead lawyer in a lawsuit over opioid painkillers.

Purdue and related defendants have moved to disqualify Linda Singer of Cohen Milstein Sellers & Toll PLLC because Singer’s office prosecuted a lawsuit over opioids against the pharmaceutical industry when she was attorney general for the District of Columbia and now is doing the same in private practice for Chicago and Santa Clara and Orange counties in California.