CHICAGO (AP) — Illinois House Speaker Mike Madigan says he has no idea why Republican state Rep. Ronald L. Sandack resigned over the weekend.

Answering questions Wednesday at a Democratic National Convention breakfast in Philadelphia Madigan said Democrats had no role in the cyberattacks Sandack cited in resigning.

Sandack, from the Chicago suburb of Downers Grove, said he faced cybersecurity issues involving fraudulent social media accounts allegedly set up in his name when he announced his resignation.