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occupant of the WH

Occupying the White House does not make you President. The Constitution clearly states that he's done on January 20th. Even if Biden was sworn in at some secret location, the video would be released immediately. Then all of Trump's orders would be meaningless, and any military person who obeyed them would be in great danger of serving a long time in the stockade. Biden would be commander in chief, and all the military would be his to command.

Trump would not be an occupant of the White House. He would be a trespasser. The location has no magical properties.