I didn't understand why McCarthy introduced a motion of censure on Schiff and demand to remove him from his Chairmanship. It all makes sense now.

Adam Schiff Hid CIA Whistleblower Concerns from Republicans on Intelligence Committee
Kristina Wong2 Oct 2019
https://www.breitbart.com/politics/2019/10/02/adam-schiff-hid-cia-whistleblower-concerns-from-republicans-on-intelligence-committee/
https://archive.is/U60Sx

House Intelligence Committee Chairman Adam Schiff (D-CA) did not notify Republicans on the committee of an intelligence official who came to one of his aides with concerns about President Trump before filing an official whistleblower complaint, according to the top Republican on the committee.
Rep. Devin Nunes (R-CA) said in a statement:

We learn from the press today that Chm Schiff had prior knowledge and involvement in the [whistleblower] complaint. He withheld this info from the American people and even from the Intel Cmte. In light of this news, it’s hard to view impeachment as anything aside from an orchestrated farce.

Fred Fleitz, former CIA analyst and chief of staff to the National Security Council, said Schiff broke committee rules in hiding that information from Republicans.
“Under @HouseIntelComm rules, any classified info brought to the committee from outside sources MUST BE SHARED WITH BOTH SIDES. Schiff broke committee rules by not telling committee GOP members about this,” tweeted Fleitz, who once worked as a staffer on the House Intelligence Committee. He added:

This is a very serious violation of @HouseIntelComm rules. Why did Schiff do this, especially when he was using this information to score political points throughout the month of August? The reason is clear: it was part of a the latest Dem ploy to take down @realDonaldTrump.