Take away his security key card, confiscate his computer and disallow him from returning to his office... He’ll get the message.
It reminds me of a preacher that got fired. The preacher upon hearing he was fired told the Elders they did not have the authority to fire him. One wise Elder stood up and said, well, we may not have the authority to fire you but you are not getting paid and you cant preach here.
Yep, “disconnect” and isolate him. Can’t do much when all forms of access are taken away.
Just turn them off. Simple. No access at all.
No he won't. He'll have to be explicitly and completely "Barred" from his office like that other snake 10 day acting Attorney General Sally Yates (may she be indicted soon).
This man is part of "The Resistance" and must be treated as such.