Also remember Rosenstein or whatever his name is. The one who appointed Mueller.
My Dad always said that intrigue only begat intrigue but why did Sessions recuse himself?
He can't be trusted to investigate a person or entity he has an interest in or an animus against. The investigation is ostensibly against the Trump campaign, and Sessions was part of that.
That doesn't mean Mueller's appointment was well taken. Just that sessions has at least an appearance of conflict of interest in investigating the Trump campaign.