I think all they did was close it to the public. I’ve read several reports on this and it seems to be ambiguous wording.
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It was reported on Am. Voice TV tonight that they were refusing to allow the republican electors into the building. It showed a clip of their lawyer talking to a policeperson who was adamant that they could not enter.
Again, they closed to the public, so I suspect the only people that in the legislators and employees in the building. Not best, republican electors are the public. They had no special right to be there beyond anybody else.