Sounded like a 9mm, and at the distances required to be able to shoot at Trump, a 9mm won’t pierce a skull, especially if its hollow point. Skulls are thicker then people realize. He’ll be fine. Thank God.
.22 and above can peirce a skull at close enough range. 9mm especially at a few yards.
You have NO IDEA WHAT YOU ARE TALKING ABOUT. A hollow point 9mm is deadly at 75 yards easy.