Sessions did not recuse himself over Russian issues. Sessions recused himself over anything having to do with the Trump election campaign. So any campaign issue is off limits to him. This is a campaign issue.
Is it really a “campaign” issue if it happened after the election to the transition team? Political issue, yes, but campaign? Not sure.
“This is a campaign issue”
This is a spying issue, not a “Campaign issue”
The campaign ended when all the polls closed on election day. This surveillance began afterward, during the transition.