If you’re unfamiliar with what Styx is talking about, McCain’s questioning of James Comey is shown in the eight minute video below.
Concisely, Senator McCain is trying to figure out why Hillary Clinton is not part of the FBI’s investigation into the (fake news) Russian investigation. Perhaps the Russians were trying to help Hillary? If they were trying to help anyone.
Actually, from where I sit, Senator John McCain was not too bad in this setting. He seems to be trying to help Trump.