On the 25th Amendment...

It’s never been tried before, but here’s how it would work.

Sec 4 of #25thAmendment provides for @VP and a majority of the cabinet secretaries (only those listed in 5 USC 101) to sign a document declaring POTUS incapable of performing his duties.

At the moment that document is transmitted to Congress, @VP becomes “Acting President.”

But what if Trump refuses to go quietly?

That’s where things could get tricky...

The amendment permits the president to claim that, despite the view of the VP and a majority of the cabinet, he is, in fact, capable of performing his duties.

If he so certified in writing, it would force Congress to assemble within 48 hours to decide what to do ...

The amendment gives Congress up to 21 days to settle the question.

If 2/3rds of the House and Senate don’t agree with VP/cabinet that the president is incapable, POTUS regains his powers.

While this has never been tried before, here’s a key point...

A 1985 Justice Department OLC opinion that looked at the legislative history of the amendment held, “The Vice President would remain Acting President until the congressional vote.”

There is one intermediate step I should mention, and that involves the VP/cabinet re-asserting — after POTUS insists he is capable — that he remains incapable.

(If VP or just enough cabinet officials waver and don’t reassert, the transfer of power to VP could be rather short.)