NCCS (Nuclear Command / Control)  

 
are boning up on the provisions of the 25th Amendment to the Constitution.

Specifically Section 4

https://en.wikipedia.org/wiki/Twenty-fifth_Amendment_to_the_United_States_Constitution#Considered_Section_4_invocations

which allows the removal of a sitting president due to incapacity.

 
Trumps inability to distinguish fact from rumor
http://www.huffpost.com/us/entry/us_583c6b62e4b000af95ef15cc