Supposedly, according to Nunes, the monitoring of the Trump campaign (incidental contacts) had nothing to do with the Russians. This was allegedly total separate from the FBI investigation of Russian meddling in our elections and whether there was collusion with the Trump campaign.
Everything that I know about Nunes tells me that he is a decent and honorable man. Something also tells me that the information he passed on to the President was even more explosive than is presently imagined. Noting that Schiff is a worm, and that anything he had been told would immediately leak to the press, Nunes goes to the President first to ensure the leader of this nation (not just the Republican in office) is apprised of a nasty situation.