So on Friday, when Officer Fanone finally got his session with Mr. McCarthy at the Capitol, he had a clear request at the ready: for the minority leader to publicly denounce the lies Republican lawmakers have been telling about the deadly attack. He wanted Mr. McCarthy to push them to stop downplaying the storming of the building, blaming left-wing extremists for an assault carried out by former President Donald J. Trump’s right-wing supporters and spreading the baseless conspiracy theory that the F.B.I. secretly planned it. He came away disappointed. “He said he would address it at a personal level, with some of those members,” Officer Fanone told reporters after the roughly hourlong meeting. “I think that as the leader of the House Republican Party, it’s important to hear those denouncements publicly.”