Count on it, if the lobbyist is a foreign diplomat. That conversation is categorically of interest as possibly containing "foreign intelligence information," and is thereby subject to being obtained without reference to a court approval.
I hope you're right, that there is something here, but note my post 60. If Saban was the "agent", there's something seriously amiss here. The fact that an American citizen is both a major donor to the Democrat party and pro-Israel doesn't equate with his being a foreign agent. There's some potential political embarassment here, and not for the dems. Still, we have to wait for the facts to come out.