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
(..) So this thing just appeared out of nowhere? How come it didn't show up on the radar? Got a minimal radar cross-section, sir. - Is it stealth? - No, sir, it's tiny. We think it's an unmanned aerial vehicle. Colonel, what are we dealing with here? - Let me make a call. (..)2008 Iron Man