George Packer in the New Yorker a couple of weeks ago:

Section 4 of the Twenty-fifth Amendment to the Constitution allows for the removal of a President who can no longer discharge his duties but is unable or unwilling to say so. It empowers the Vice-President, along with “a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide,” to declare the President unfit and to install the Vice-President as Acting President. Section 4 has never been invoked. In 1987, when Ronald Reagan appointed Howard Baker to be his new chief of staff, the members of the outgoing chief’s team warned their replacements that Reagan’s mental ineptitude might require them to attempt the removal of the President under Section 4. Baker and his staff, at their first official meeting with Reagan, watched him carefully for signs of incapacity—but the President, apparently cheered by the arrival of newcomers, was alert and lively, and he served out the rest of his second term.

Yiiiiiiiiikes I didn’t know that.

Trump is “alert and lively” – but he’s “alert” to wrong things and he’s lively in wrong and terrible ways. Apathy and lassitude are not the only forms of mental incapacity.

As Packer goes on to say:

After a month in office, Donald Trump has already proved himself unable to discharge his duties. The disability isn’t laziness or inattention. It expresses itself in paranoid rants, non-stop feuds carried out in public, and impulsive acts that can only damage his government and himself. Last week, at a White House press conference, the President behaved like the unhinged leader of an unstable and barely democratic republic. He rambled for nearly an hour and a half, on script and off; he flung insults at reporters; he announced that he was having fun; and he congratulated himself so many times and in such preposterous terms (“this Administration is running like a fine-tuned machine”) that the White House press corps could only stare in amazement.

He’s slightly manic most of the time. In someone with the faults and deficits he has, that’s not a plus.

It won’t get better. The notion that, at some point, Trump would start behaving “Presidential” was always a fantasy that has the truth backward: the pressure of the Presidency is making him worse. He’s insulated by sycophants and by family members, and he can still ride a long way on his popular following. Though the surge of civic opposition, the independence of the courts, and the reinvigoration of the press are heartening, the only real leverage over Trump lies in the hands of Republicans. But Section 4 won’t be invoked. Vice-President Mike Pence is not going to face the truth in the private back room of a Washington restaurant with Secretaries Betsy DeVos, Ben Carson, and Wilbur Ross, or in the offices of Speaker of the House Paul Ryan and Senate Majority Leader Mitch McConnell. Republican leaders have opted instead for unconstrained power.

It’s their big chance to destroy the environment, make poor people even poorer, make sure health insurance will never be universal and tax-funded, make it harder for minorities to vote, and end public funding of arts and humanities endowments.