[aaron-lebo]

At some point you simply make too many enemies.

Dems already hate him and this removal continues his conflict with the traditional GOP.

He's either gonna cross the wrong person or be so unpopular that he's gone in a few more years and nobody will care.

[cthulha]

There doesn't seem to be any Democrat involvement with this. Every recent development is to do with Trump-Russia investigation.

Seems unlikely that Democrats would have supported him much, but it sounds like they weren't asked to -- they were told at 5.30pm that he was fired, same as everyone else!