Yes, as I read this thread, you are the first poster I see to highlight presidential security protocol procedures, the 214th post. I was wondering when someone would bring it up. :)
This was either a screw-up by some of the Chileans
The most likely answer.
It's being investigated.
Of Course.
IMHO, I believe the USSS agent acted in error, possibly egregiously. When he was confronted, and struggled, he took himself out of position to protect the President. Wha he shoudl have done, when his access was blocked, was stop, stand still,and loudly call out.."Mr President, please do NOT enter the room sir.."
A revision for the SS regulations.
214th = 255th
The other thigs I noticed from the pics is that this USSS guy must be the smallest one they have. Where's the 6'5" 280 lb.shaven head dude who played linebacker bor BC, nd then was a Recon Marine, before joing the USSS?