The senile old man John McCain is the one who took internet fan fiction alleging that Trump was in contact with Russia to the FBI chief James Comey. There is no doubt that McCain’s personal grudge with Trump compelled him to spread lies to US intelligence communities.
But McCain has a long history of divulging information.
From The Guardian:
Senator John McCain passed documents to the FBI director, James Comey, last month alleging secret contacts between the Trump campaign and Moscow and that Russian intelligence had personally compromising material on the president-elect himself.
The material, which has been seen by the Guardian, is a series of reports on Trump’s relationship with Moscow. They were drawn up by a former western counter-intelligence official, now working as a private consultant.
The Guardian has not been able to confirm the veracity of the documents’ contents, and the Trump team has consistently denied any hidden contacts with the Russian government…
The Guardian can confirm that the documents reached the top of the FBI by December. Senator John McCain, who was informed about the existence of the documents separately by an intermediary from a western allied state, dispatched an emissary overseas to meet the source and then decided to present the material to Comey in a one-on-one meeting on 9 December, according to a source aware of the meeting. The documents, which were first reported on last year by Mother Jones, are also in the hands of officials in the White House.
McCain is not thought to have made a judgment on the reliability of the documents but was sufficiently impressed by the source’s credentials to feel obliged to pass them to the FBI.
The Senate armed services committee, which Senator McCain chairs, launched an inquiry last week into Russian cyber-attacks during the election.