In his new book, Sen. John McCain (R-AZ) defends his decision to give a controversial dossier about President Trump to former FBI chief James Comey.

"I agreed to receive a copy of what is now referred to as 'the dossier,'" McCain writes in the upcoming book, titled The Restless Wave, referencing information compiled by former British intelligence officer Christopher Steele. "I reviewed its contents. The allegations were disturbing, but I had no idea which if any were true. I could not independently verify any of it, and so I did what any American who cares about our nation's security should have done."

The Daily Beast obtained an advance copy of the book, due out May 22.