Further to Paul’s report, the NDP reports the explanation they received as follows.
“That it was a technical briefing for the press, and that media only were allowed on site as per press gallery policy.”
So, er, this was the Press Gallery’s doing?
“The Press Gallery kicked them out,” says the NDP in a second email. “The government is fully aware of the rules, and clearly chose the location on purpose.”
This will almost certainly get sillier before it gets better.