Well if there was no warrant then it was warrantless wire tapping
and the investigation gets even more interesting
either way someone is screwed
And now Sessions needs to UN-RECUSE (or narrow down his recusal) because the people who did this will claim they were performing “due diligence” (har har) to protect the Republic from Russian infiltration of Trump’s campaign
If Sessions does not do this then Trump effectively has NO ATTORNEY GENERAL on this case - only some Obama appointee or 2d hand pony
The wiretapping (legal or not) of Trump’s phone and computer servers and the possible bugging of his residence and office will require a separate investigation from which, at this time, Sessions has not recused himself.