My new book (tinyurl.com/y4r3xlhy) answers these questions in detail, but to give a Twitter-sized version:
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2. It can cover other sorts of cases too, but in such cases it's designed to put two heavy thumbs on the president's side of the scale:
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B: If the pres. is able to challenge the invocation of 25A, he regains power unless 2/3 majorities in both houses vote against him—a very high bar.
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4. Concededly, it might also work on a pres. who's only impaired but has nuttily ordered an imminent catastrophe (e.g. nuke strike).
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