That question has already been answered, based on a news report in
Bloomberg News (and you can find many more like it).
If the president was to activate a launch code on his 'football' that code goes to the war room at the Pentagon in Arlington, Virginia. The senior officer on duty then authenticates it has come from the president by replying with a challenge code, a brief phonetic sequence. The president then consults the "biscuit," the laminated card the president or a military aide carry at all times, and replies. Again, it's a brief phonetic code. If the president gives the correct reply the order to deploy is flashed to units all over the world. The news report estimates from the president ordering a strike to the missiles in the air is five minutes.
Link
No one is suggesting this is about to happen but if it ever was going to happen this is undoubtedly the president who'd do it. Running naked slathered with feces? How about becoming morbidly depressed, delusional, deciding to end it all and take the whole stinking world with him.
Look at the photo below. Someone posing with the military aide carrying the code briefcase. In a dining room at Mar-a-Lago. This is what gives the security people nightmares. How could a terrorist cell exploit an opportunity like this? They can see it on Facebook the same way everyone else can.
Trump scares people, especially here in New York where we have had a steady diet of this guy for thirty-five years. Every time this man has gotten away from his core business, developing real estate, he not only failed he failed spectacularly. The USFL, Trump Shuttle, the casinos. None of them even
exist anymore. Now he's president of the United States...