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
(..) Huh? Oca! Oca! Looka too! Huh? We're stealth ninjas. We make no sound. Right. Gotcha. Ya! All right, El Macho. You're going down. (..)2013 Despicable Me 2