He’s, um, not going to do that.
But there’s no way that Pence is going to invoke the 25th Amendment — at least right now.
1) Section 4 of the 25th Amendment, the part that deals with how to remove a president (with a majority of the Cabinet and the vice president) has never been invoked since it was put into law in 1967. (Other parts of the 25th Amendment have been used — it’s how Vice President Gerald Ford assumed power following the resignation of President Richard Nixon.) Pence isn’t going to make that sort of history unless he feels as though he absolutely has to. And he’s not there yet.
Remember that at this time last week, Pence still thought his four-year project — subjugating himself to Trump in hopes of inheriting the outgoing President’s political base in 2024 — was on track. Now the vice president is being forced to grapple with an entirely new political reality that includes his one-time benefactor not only turning from him but in fact blaming him for not changing the results of the election.
My educated guess is that Pence doesn’t want to antagonize Trump any more than he has to over the coming days.
Which means that if Trump stays quiet — or at least doesn’t do something as or more dangerous than inciting a riot at one of the government’s most visible symbols — Pence will let all of the 25th Amendment talk stay purely in the realm of the hypothetical. Although it’s not at all clear doing so will salvage his relationship with Trump.