This is covered by the 25th amendment...
https://en.wikipedia.org/wiki/Twenty-fifth_Amendment_to_the_United_States_Constitution

but I don't see where this addresses the mentally unstable aspect. So, this can be used for any reason whatever, as long as the Veep and the appropriate majority agree?

they put in the clause for the President to disagree and Congress to ultimately decide highlights the
intention to deal with a President that might just be crazy.

FYI the Cabinet is the body that decides along with the VP.

Section 4. Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President.

Thereafter, when the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that no inability exists, he shall resume the powers and duties of his office unless the Vice President and a majority of either the principal officers of the executive department or of such other body as Congress may by law provide, transmit within four days to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office. Thereupon Congress shall decide the issue, assembling within forty-eight hours for that purpose if not in session. If the Congress, within twenty-one days after receipt of the latter written declaration, or, if Congress is not in session, within twenty-one days after Congress is required to assemble, determines by two-thirds vote of both Houses that the President is unable to discharge the powers and duties of his office, the Vice President shall continue to discharge the same as Acting President; otherwise, the President shall resume the powers and duties of his office.[3]

Section 4. Whenever the Vice President and a majority of either the principal officers of the executive departments or of such other body as Congress may by law provide, transmit to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office, the Vice President shall immediately assume the powers and duties of the office as Acting President.

Thereafter, when the President transmits to the President pro tempore of the Senate and the Speaker of the House of Representatives his written declaration that no inability exists, he shall resume the powers and duties of his office unless the Vice President and a majority of either the principal officers of the executive department or of such other body as Congress may by law provide, transmit within four days to the President pro tempore of the Senate and the Speaker of the House of Representatives their written declaration that the President is unable to discharge the powers and duties of his office. Thereupon Congress shall decide the issue, assembling within forty-eight hours for that purpose if not in session. If the Congress, within twenty-one days after receipt of the latter written declaration, or, if Congress is not in session, within twenty-one days after Congress is required to assemble, determines by two-thirds vote of both Houses that the President is unable to discharge the powers and duties of his office, the Vice President shall continue to discharge the same as Acting President; otherwise, the President shall resume the powers and duties of his office.

Just didn't recall anything dealing with that situation.

But I didn't read of a procedure for this situation.

Who says he has mental instability? Is a psychiatrist's diagnosis necessary? What is the tool used, since this isn't an impeachment for "high crimes and misdemeanors."

That's really what I was asking.

People have explained on DU but it's still kind of sketchy, the way the constitution is written.

there will be no actions taken.

It is really that simple. It worked the same way when Reagan was President.

They are lobbyists fro the 1%.

The main thing was to keep him there, since he was presumably easy to get to sign things. Iran-Contra and all that.

But Trump, while easy to trick, isn't unable to function. He has a strong, willful personality. Still, he doesn't understand these politicians and might be easy to trick or get to sign things.

OTOH, he is surrounded by a close team of people who haven't lost their marbles. They wouldn't be easy to trick.

And Trump certainly shows no interest in learning about the issues.

Congress just has to vote it.

"many cabinet members were said to be unaware of its contents."

If you are going to be a cabinet member, please read the Constitution at least once.

congresscritters to vote to remove the president.

Also, most competent readers do not memorize everything they read. They particularly don't memorize parts of the text they deem most likely irrelevant. Considering the 25th has never been used, seldom even considered, in the 50years since it's addition, it does not seem unreasonable to use memory cells to house items more likely to be useful.

but I would expect them to remember at least that there's "something in the Constitution that covers this because I read it
once".

It isn't long and there's a lot of thought and intelligence in it.

For instance, it is not easy to change it, however it provides the methods to do so.

And... there are no do overs for presidential elections.

One of the more recent amendments is #25. That's one we all ought to become familiar with. One only hopes that the White House staff has enough straight jackets for when Drumpf goes further off the deep end.

In short, it's a Chum some of this shit... We're going to need a bigger boat! scenario.

I'll read (or re-read, as the case may be) the 25th. Consider me bi__h slapped!

I think we can assume they will leave him in the WH as long as possible.

Its also their own involvement in the FBI debacle.

Remember Guiliani knew what Comey was planning.

are there to do what is best for the country rather than the party. So it is impossible
the 25th Amendment will be used unless he ends up rolled up in a ball crying under the desk
in the oval office or kills millions of people.