Sorry, I don’t think it’s normal - or constitutional - for federal departments to decide they want to “invoke” the 25th amendment to impeach a president, particularly since their only reason for discussing this was that they didn’t like him and had expected Hilary to win.
Frankly, I think the only reason they backed off and went for a protracted campaign to harass and handicap him was that they realized that Pence would then become president. And I think Pence is definitely less warm and fuzzy and long-suffering than Trump, so they were scared. Of course, next they would have discussed some way of getting rid of Pence too.
The question is whether it is criminal to engage in this sort of thing. And I don't think I'm going out on a limb here when I suggest that it's NOT.