Arizona Senator who disowned Trump before election admits he handed document outlining claims of Kremlin blackmail to FBI

Brief statement claims that he received it and gave it directly to FBI Director James Comey because he was 'unable to make judgment about accuracy'

But Washington reporter Carl Bernstein says former British ambassador to Moscow handed it to McCain

Ambassador has not been named - and author of report also gave to FBI agent he knew at its station in Rome months ago

Report was apparently paid for first BY Republican enemies of Trump then by Democrats

Sworn Donald Trump enemy John McCain admitted Wednesday that he passed the dossier of claims of a Russian blackmail plot against the president-elect.

The Arizona senator issued a public statement amid mounting questions of his exact role in the affair - and how a document riddled with errors and unverifiable claims came to be published.

'Late last year, I received sensitive information that has since been made public,' he said.

'Upon examination of the contents, and unable to make a judgment about their accuracy, I delivered the information to the Director of the FBI. 

'That has been the extent of my contact with the FBI or any other government agency regarding this issue.'

But the 2008 Republican loser, who disowned his party's candidate weeks before the election, may have been far more intimately involved than that.