The outspoken executive that drug maker Pfizer Inc. fired this month because the government didn’t pursue his whistleblower suit filed a wrongful dismissal suit against his former employer.

Dr. Peter Rost, a former vice president of marketing, filed the suit Monday in U.S. District Court for the Southern District of New York, alleging that Pfizer violated the New Jersey Conscientious Employee Protection Act and the whistleblowing prohibition of the federal False Claims Act. Rost claims such laws protect him from termination because he was a whistleblower.