On the first day DC voters could use drop boxes, someone ordered the federalized National Guard troops -- which Trump has stationed in DC for the duration of his presidency -- to guard them, armed with assault rifles and in full combat kit.
That's illegal under half a dozen US laws. Trump did it anyway, because if he loses one or both houses of Congress in November, he's a lameduck, pissing into the wind.
https://www.commondreams.org/news/national-guard-dc-ballot-box