This law site (updated Nov 2024) also lists treason, so there should be grounds to revoke his citizenship.

I mean, he wouldn’t be allowed to become a citizen with his current behaviour, so why keep him as one?

I’m not optimistic at all that anything will be done, but it sends a message that this fucker is not wanted here. And if Trump does end up pushing for war with Canada, Musk should face criminal charges here as being part of team 51st State.