That's exactly what impeachment is for. In abstract. The united front of the Cabinet and VP would be a kick in the ass to get Congress moving on impeachment.
If Trump nuked Cincinnati tomorrow for "no reason", that would be facially impeachable. (Well, at that point maybe other things should be done, but we can't discuss those.)
Even from a purely consequentialist perspective, impeachment is always easier than 25th Amendment, so you always go with impeachment.
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