Might the solution be an independent agency which centralises whistleblowing? Whose decisions are appealable to the courts and legally required to balance public interest and national security?
Let's not forget someone whistleblew on the President amid a highly political environment in recent memory. That's no short order.
Anything else is treated differently. Stuff like waste, abuse, environmental issues, discrimination and the like are usually a different ballgame.
https://en.wikipedia.org/wiki/National_security#Impact_on_ci...