Let's be honest, if the Veep and Cabinet invoke the 25th, no one will care about Trump's letter signalling his fitness. They will just wait for Pence to give the follow up letter.
The context of the 25th Amendment has been and always will be, when a President is physically dead or not available to perform his duties, is the Veep now President or merely 'caretaker'. This was the original discussion when Presidents started dying in office and the 25th only codified what was practiced since the mid 1800s.
It will never be a substitute for impeachment.
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