Nothing that would line a suit and still have it look anything like a suit wouldn’t protect against anything worth being protected against. A bulletproof vest isn’t magic armor that makes you invulnerable. A shot from anything realistic would easily break multiple bones and cause internal damage. And that’s with the bullet stopping at the vest.
Which is unfortunate I think. Any potential message that might resonate with trump supporters will be ignored because of that. If you make a TV show using explicit parallels like pizzagate, they can easily make that connection and ignore the overall message. It’s just like pointing out their hypocrisy in real life. They may or may not still enjoy it, but the message is lost.