Cabinet, or the DOD, DOJ, or such. Executive departments are a pretty long list, but I doubt a letter from the principles from the Department of Agriculture is gonna carry much weight with invoking the 25th. It's the one part of the 25th that's never been invoked, for good reasons.

My worry is that the FBI is gonna go with her on it. They're an executive department, as defined by the Constitution - but she still needs the VP. And, all Trump has to do is write them an official 'I'm fine, you dumb, drunken cunts", and it's a non-issue.

Her going down that path, to me, is clear cut treason. I know it won't happen, but in a just world, Trump would let her try, and when she actually does it, haul her before a military tribunal under charges of treason and insurrection.