He says his political enemies have been conducting a 'stealth' [='secret'] campaign to block his nomination.
The fox uses 'stealth' and cunning to hunt its prey.
a 'stealth' bomber/fighter
(..) If I was building Iron Man and War Machine, It's Iron Patriot now. - That's way cooler! No, it's not. Anyway, I would have added in the retro- Retroreflective panels? - To make him stealth mode. You want a stealth mode? - Cool, right? That's actually a good idea. Maybe I'll build one. (..)2013 Iron Man 3