Best bet? The Park Police, FBI-associated uniformed officers, and additional Secret Service Police (i.e., the uniformed law enforcement officers of the Secret Service, whose job is generally to patrol the area around the White House).
Any of them. The DC National Guard is a military force. I would prefer not to have them engage in civilian policing unless and until there are exigent circumstances. Frankly, the redhat spin would be a lot easier to sell this week if the story had been “DC National Guard opens fire on Republican protestors approaching the U.S. Capitol.”
I don’t discount that possibility.
