DOJ policy does NOT support indicting POTUS.
If DOJ finds potential crimes by a POTUS, Congress considers what to do about it.
It's the precedent on WHO assesses findings on obstruction: Congress not the President's AG
Like, Janet Reno didn't resolve obstruction re Clinton
Nor AG Richardson re Nixon
So Barr is out beyond precedent
I am Mueller's lawful boss; I reached a view on his findings; that in no way 'prevents' the House from doing or not doing anything
Indeed, something like that could be his 1st rebuttal in a Congressional hearing.