[1] https://en.wikipedia.org/wiki/United_States_Foreign_Intellig...
The lengths that the NSA and CIA would go to to implant backdoors (interdicting shipments of laptops/phones and doing the work themselves) further suggests that they cannot compel this sort of action.
If they have a path to covertly compel action as a state secret under National Security / anti-terror laws we will only hear about it from whistleblowers. It won't be something the target can disclose let alone test in court.
FWIW I also don't believe in Apple's nobility as resisting on user's behalf. They happily bow to the state and remove apps for e.g. organising protests, monitoring deaths in US wars, csam scanning etc. IMHO their interest in encryption is to prevent jail-breaking and protect their app-store cash cow.
> interdicting shipments of laptops/phones and doing the work themselves
I don't think that proves anything about their powers. Given the option, I'm sure they would prefer to install things themselves without third-party knowledge or consent.
We have evidence of complicit action e.g. black rooms like Room 641A. I think the nature of "consent" and "obligation" gets pretty grey when it comes to the security agencies. They don't get results using court orders. I'm sure they have assets employed as staff in security sensitive positions.