I thought McCain was at one point involved in this dossier business

He was involved in leaking it to the press.

quote:

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McCain and Kramer, a former official at the McCain Institute, were first told about the dossier in November, during a conversation with Sir Andrew Wood, a former British spy and associate of Steele’s. McCain then dispatched Kramer to meet with Steele in London on Nov. 28.

Steele, who operates Orbis Business Intelligence in London, has revealed in the London lawsuit that he allowed Kramer to view the dossier but did not provide him a copy. He said that an “arrangement” was later made for Fusion to provide a copy of the dossier to McCain through Kramer.

McCain then provided a copy of the document to Comey during a Dec. 9 meeting.

Four days after McCain met with Comey, Steele would produce the final memo of the dossier, the one that was provided to BuzzFeed and which included the allegations against Gubarev.

Steele sent the final memo to Fusion with instructions to pass a hard-copy to Kramer and McCain. It is unclear how the dossier was disseminated after that. Fusion has not said whether it disseminated the final version of the dossier to anyone outside the company.

The denials by Steele, Fusion and McCain that they were BuzzFeed’s sources leaves just a few posibilities, including Kramer.

Kramer has not responded to multiple requests for comment about his handling of the dossier or whether he gave it to any news outlets. He has not talked on the record to any reporters since being identified in the

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https://www.zerohedge.com/news/2017-10-20/did-john-mccain-provide-infamous-trump-dossier-buzzfeed

The real question regarding McCain is this:

Was the opposition research FOR the Democratic candidate in McCain's hands brought to the attention of the RNC and the Republican candidate by McCain? If not, then he's a traitor to his party.