Only one time use.
Think of like world leaders, celebrities, ya know 😉. Are you gonna make them do some embarassing things, or illegal acts.
My answer:
spoiler
Take control of an NSA agent with access to the most powerful hacking tools, hack everyone’s phone, install a program that randomly have a popup at random intervals, the popup message says “I’m watching you”. This also tries to spread itself to any other phone it can connect to. Pure chaos 😈
Pretty sure I can do this in a minute, depending on how good the NSA tools are.
The actual problem here is that it’s not clear when he will be near a gun to the point that someone could do that. You only have a minute. Is Trump within a minute’s range of a gun and would not be stopped by his security detail if he tried to use it?
My thought process is: Turn to security guy, say, “gib gun plz, pres order”. Offhand I dunno if they’d comply, but worth a shot (see what i did there?)