just an idea,

Trump should wear a firm ceramic/steel patch over his heart at all times to avoid a glass/frozen dart.

Also keep some carbon tablets and epinephrine, dopamine, cardiovasculative constricting and relaxing components on a medic at all time.

They know a bullet won't work well enough, they will use ether a dart or a large weapon/bomb, in which case the epinephrine will come in handy anyway as will auto-cauterizing patches.

I wonder if those exist or I could patent those, because apart from being a little brutal, that could save some lives.