a constitutional question
If you would prefer a President Pence to a President Trump — an alluring prospect to many anti-Trump social conservatives, as well as a majority of Democrats per recent polling — the 25th Amendment might sound like just the ticket. It provides that if the president is deemed "unable to discharge the powers and duties of his office," Congress can pull some strings to produce our new President Pence.
In the 50 years since the 25th Amendment was ratified, it's been used twice to fill a vice presidential vacancy: when Gerald Ford replaced the disgraced Spiro Agnew in October 1973, and when Nelson Rockefeller replaced Ford in 1974. And on six occasions, the president has invoked the 25th Amendment to (very temporarily) designate his veep as acting president, always during routine medical procedures like a colonoscopy. But it's never been invoked when the president himself was non compos ...
The notion that Pence and a Cabinet majority will look at Trump's next tweets or telephonic fulminations and decide he's not fit for the job is beyond absurdity. ... In the midst of a shooting war in Vietnam, and a Cold War on constant simmer, Nixon was often abusing alcohol and prescription drugs, leading to stretches of incoherence and irrationality. No one around him even raised the specter of invoking the 25th Amendment. [Politico]
Read the rest of Politico's rationale here.