If I am not mistaken, the president cant launch a nuke without concurrence of the sec of defense.
At some point, maybe two years into the Nixon era....he took to drinking excessively at lunch, and was pretty much wasted from 1 PM on.
Eventually, Kissinger instructed the Nixon handlers to personally call him if anything came to rattle Nixon or if Nixon started talking about ‘nuking’ someone. So the attaché-case guy holding the codes...was basically waiting for Kissinger’s instruction....should anything pop up (not Nixon).
This anti-Trump screed discusses the subject:
https://www.bbc.com/news/world-us-canada-42065714
The answer is kinda complicated—it would depend on whether anyone felt like risking their career that day...
If Bidet was determined to do it, it is unlikely anyone could stop him.