I like to dream of a better future from time to time and I started to ponder this hypothetical situation.
Suppose, just for a moment that some future POTUS decides that “Executive Privilege” has been wildly abused by previous occupants of the Oval Office. It’s been decided that the best option is to strictly and narrowly define in a very public way exactly what “Executive Privilege” means, what it covers and what it very specifically does NOT cover. Even more importantly, in this hypothetical, the current POTUS wants to make sure that future Oval Office inhabitants can’t easily undo this reform.
One option is to aggravate everyone in the world until it all comes crashing down in a major smack-down from SCOTUS. Even then, enforcing it could be an issue and it could be overturned by a future SCOTUS ruling. While potentially entertaining, this is messy.
Congress has little to no authority to define or limit the power of the Executive branch beyond the specifics already contained within the constitution (I think). Anything that comes strictly from one POTUS can just be undone by the next (I think). Absent action from SCOTUS, can this be accomplished without a constitutional amendment and an indeterminate number of porcine aviators?