Lawmakers want answers from a drug maker that two years ago denied engaging in price fixing after two former executives were charged with allegedly doing that.

The Justice Department charged former executives with Heritage Pharmaceuticals earlier this week with price fixing the antibiotic doxycycline hyclate and another drug. The charges rankled Rep. Elijah Cummings, D-Md., and Sen. Bernie Sanders, I-Vt., who asked Heritage in 2014 about price fixing.