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

Sen. John McCainJohn Sidney McCainMark Kelly releases Spanish ad featuring Rep. Gallego More than 300 military family members endorse Biden Jennifer Lawrence says until Trump she was 'a little Republican' 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 TrumpFox News president, top anchors advised to quarantine after coronavirus exposure: report Six notable moments from Trump and Biden's '60 Minutes' interviews Biden on attacks on mental fitness: Trump thought '9/11 attack was 7/11 attack' 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 ComeyTrump has list of top intelligence officials he'll fire if he wins reelection: report Trump and advisers considering firing FBI director after election: WaPo Trump remarks put pressure on Barr 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) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout 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 ClintonHarris lists out 'racist' actions by Trump in '60 minutes' interview: 'It all speaks for itself' Trump has list of top intelligence officials he'll fire if he wins reelection: report Clinton says most Republicans want to see Trump gone but can't say it publicly: report 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.