If you are facing whistleblower retaliation as a result of whistleblowing, immediately obtain legal counsel from a whistleblower attorney. The reason is simple. What you blow the whistle on and the method you use to make your disclosure will determine your rights going forward. It is to your advantage to make your disclosure according to the laws that will provide you with the maximum protection.
See the following rules:
Most federal laws permit you to file whistleblower cases before your company fires you. Supreme Court precedent has broadly defined adverse action, to include things like demotion, transfer, or change in job duties. See: Rule 24: Get to the Jury.
The moment you believe whistleblower retaliation is occurring, contact a whistleblower attorney to see if you can file a claim. You should not wait until you the company fires you.