Apparently, you haven't been paying much attention.
From wikipedia:
"In United States politics, a ranking member is the most senior member of a congressional or state legislative committee from the minority party."
IF you have subpoena powers like Schiff does you can get any phone records you want, even private citizen’s records. That’s why these people are so dangerous, they are like a secret police.
What they can’t get without a warrant is an actual recording of the conversation. The fact that Nunes has talked with Viktr Shokin about the facts in his firing is totally innocuous unless you are worried that Joe Biden did something wrong.
You missed his point. He is simply pointing out that the article is listing (D-CA) after Nunes name.