Protected from being pushed around, yes; protected from impeachment, no. Especially when there is evidence he violated the law; for just one example, as in conspiring to destroy evidence covered by a congressional subpoena.
Of course, he might be quite willing to provide new actionable info and just "quietly" resign in return for not being impeached.
Initially Comey listed ad-nausem all the reasons that hillary should be prosecuted and then recommended her not be prosecuted!
Few figured that one out.
But it's the same answer as his comments several days before the election on why he wouldn't recommend prosecution.
Think about it.He has 100 FBI resignations on his desk from agents who worked thier asses off on the foundation and hillary etc. His people are severely pissed off at him. Why isn't he recommending prosecution so we all will feel better about things?
Comey knows that if he recommends prosectution to Loretta Lynch the prosecutorial body,he's just the investigative body, that all the hard work all the angst all the discoveries made by his agents go up in smoke since the regime will not prosecute Hillary!! what they will do or try to do is to destroy any and all evidence against her or any high ranking dem so none of this will ever see the light of day.
Maybe it's just possible Comey does not want that to happen.
Maybe he would rather give all his evidence to sayyyyy a Jeff Sessions rather than a Loretta Lynch. Does that make any sense? Yeah I think so.