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

Sen. John McCainJohn Sidney McCainArizona GOP censures top state Republicans McCain, Flake and Ducey Whoopi Goldberg wears 'my vice president' shirt day after inauguration Budowsky: Democracy won, Trump lost, President Biden inaugurated 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 TrumpNYT: Rep. Perry played role in alleged Trump plan to oust acting AG Arizona GOP censures top state Republicans McCain, Flake and Ducey Biden and UK prime minister discuss NATO, multilateralism during call 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 ComeyBiden to keep Wray as FBI director Comey: 'Republican Party has to be burned to the ground' Juan Williams: The real 'Deep State' is pro-Trump 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 (Bob) MuellerWhy a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel CNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump 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 ClintonBiden must wait weekend for State Department pick Texas Supreme Court rejects Alex Jones request to toss lawsuits from Sandy Hook parents Paris Agreement: Biden's chance to restore international standing 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.