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

Sen. John McCainJohn Sidney McCainWhy did Mueller allow his investigation to continue for two years? If you don't think illegal immigrants are voting for president, think again 10 factors making Russia election interference the most enduring scandal of the Obama era 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 TrumpDemocrats' CNN town halls exposed an extreme agenda Buttigieg says he doubts Sanders can win general election Post-Mueller, Trump has a good story to tell for 2020 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 ComeyDavis: The shocking fact that Mueller never would have accused Trump of a crime Sarah Sanders is entitled to her opinions, but not her own facts James Comey, wife donated ,400 to Klobuchar's presidential campaign 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) 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 ClintonDavis: The shocking fact that Mueller never would have accused Trump of a crime Trump says he would challenge impeachment in Supreme Court The Hill's Morning Report - Will Joe Biden's unifying strategy work? 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.