Well, this whole "wiretapping" ( I'm talking generic sense ) thing is getting to be a PARTISAN thing.
The Dems want this to look like a legitimate operation against foreign influence.
The Republicans ( those who support Trump at least ) want to make it look like HE was deliberately targeted in order to form the "Trump Colluded with Russia to win the elections" narrative.
Nunes and Schiff are simply participants in this struggle.