Rifle rounds go straight through medium vests, you need a really heavy and bulky vest to stop them, Trump wouldn't wear one of those. The typical vests you see just stop low caliber bullets like pistols, and then you hope secret service can stop anyone with a rifle from getting a shot.
The times I’ve worn vests I’ve had to have ceramic plates in for ak-47 style bullets, but I’d assume that the secret service would have something more fancy available.
There is actually now very expensive cutting edge stuff (FRAS) that’s flexible and can barely stop a 5.56 round, and i’d assume important people have whatever top secret upgrade exists for that, but that could be wrong.
