I think what Trump wants to do is move the daily press briefings to a new room at a building close to the White House. Since some of those buildings close by are connected to the White House by underground tunnels, so White House press office can have people walk from the White House to the new press briefing room nearby. The current press briefing room is woefully overcrowded in daily use, and I think even Hillary Clinton, had she become President, would have asked to move the daily press briefing room somewhere else—if only for fire safety reasons!
From videos I've seen, I was actually shocked that they were stuffed into so small a space.
As a builder, Trump is probably aware that they've may have been pushing the margins on safety up until now. If he wants new media to have access, they need more room.
Yes, the flatulent emissions that the press believes to be "journ-o-lism" would certainly constitute an explosive mine gas hazard.