I can't believe it. We got hypersonic Donald Trump before the next chapter of my Teen Titans book.
The shooter was approximately 120 metres away when he fired at trump. Assuming he fired at trump with a .223 Remington round (standard for an AR-15), which had a muzzle velocity of 990 m/s, it took about 120 ms for the bullet to reach him. The fastest ever reaction time for a human is 100 ms, meaning he turned his head 45 degrees to the side in 20 ms. The average time it would take for a normal human to do that would be \~444 milliseconds, making him 22.2x faster than a normal human.
Which means that, depending on his reaction time, he scales somewhere between subsonic+ (276 m/s) to massively FTL