McCain defends giving dossier to Comey: 'I would do it again'

Sen. John McCainJohn Sidney McCainControversial Trump judicial nominee withdraws Trump vows to hold second meeting with Putin Ex-Montenegro leader fires back at Trump: ‘Strangest president' in history MORE (R-Ariz.) wrote in his upcoming memoir that he does not regret alerting the FBI about the so-called Steele dossier, which details President TrumpDonald John TrumpNFL freezes policy barring players from protesting during anthem McConnell spokesman on Putin visit: 'There is no invitation from Congress' Petition urges University of Virginia not to hire Marc Short MORE’s alleged ties to Russia.

McCain acknowledged in January 2017 that he delivered a dossier of “sensitive information” to then-FBI Director James ComeyJames Brien ComeyThere was nothing remotely treasonous in Trump's performance with Putin Opinion: One FBI text message in Russia probe that should alarm every American Clapper: Intel officials showed Trump evidence of Putin's role in election meddling MORE.

In his upcoming book, "The Restless Wave: Good Times, Just Causes, Great Fights, and Other Appreciations," McCain wrote that he "did what duty demanded I do" in passing on the documents.

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“I discharged that obligation, and I would do it again. Anyone who doesn’t like it can go to hell,” McCain said, according to excerpts of the book published by The Guardian.

He added that any risk that the president might be compromised by Russians "had to be investigated."

The Steele dossier has been at the center of investigations into Russian meddling in the 2016 election conducted by congressional committees and special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE. Trump has repeatedly called the latter's probe a "witch hunt" and a "hoax."

The document has been a source of controversy, as it was funded partly by the Democratic National Committee and Hillary ClintonHillary Diane Rodham ClintonProminent Putin critic: If Trump turns me over, I'm dead Dems unveil slate of measures to ratchet up pressure on Russia Trump tweets old video of Clinton talking up 'a strong Russia' MORE’s presidential campaign.

It started out as an opposition research document funded by the conservative website The Washington Free Beacon.

The dossier contains claims about Trump's ties to Russia, including some salacious allegations about the president. Some of the claims have not been verified.

Comey, who was fired in May 2017, has said that Trump was fixated on disproving some of the more scandalous claims in the dossier.