Saad was an employee at a chemical company called FGR Inc. He noticed that several of the security personnel at FGR allowed tankers to be filled over the legal limit with highly inflammable gases. Saad gathered ample evidence of such instances and presented it to senior management. A few months later, the company had not acted, and Saad contacted the Occupational Safety and Health Administration. Less than a week later, the company fired Saad. Assuming that Saad had not had disciplinary issues and wanted to file a claim alleging he was wrongfully discharged, what would be the strongest basis for his claim