McCain in new book: 'Maybe I’ll be gone before you hear this'
© Greg Nash

Sen. John McCainJohn Sidney McCainOvernight Energy: Lake Mead's decline points to scary water future in West | White House leads opposition to raising gas tax | Biden taps ex-New Mexico lawmaker for USDA post Lake Mead's decline points to scary water future in West Five takeaways from the Biden-Putin summit MORE (R-Ariz.) says in a recently released excerpt from his upcoming memoir that he isn't sure how much time he has left to live.

McCain, 81, was diagnosed with glioblastoma, an aggressive form of brain cancer, last year.

“I don’t know how much longer I’ll be here,” McCain says in his book “The Restless Wave: Good Times, Just Causes, Great Fights, and other Appreciations.” The excerpt was provided to NPR on Thursday.

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Advances in oncology could uncover new cancer treatments that may extend his life, McCain says, noting that he could live another five years.

“Maybe I’ll be gone before you hear this,” he says. “My predicament is, well, rather unpredictable. But I’m prepared for either contingency or at least I’m getting prepared.”

Part of that plan, he says, includes talking to "my fellow Americans a little more."

McCain acknowledges in his book that this will be his last term in the Senate, according to other excerpts released last week.

“I’m freer than colleagues who will face the voters again. I can speak my mind without fearing the consequences much. And I can vote my conscience without worry,” he writes.

But the memoir isn't entirely apolitical — the senator also takes aim at President TrumpDonald TrumpWhite House denies pausing military aid package to Ukraine Poll: 30 percent of GOP voters believe Trump will 'likely' be reinstated this year Black Secret Service agent told Trump it was offensive to hold rally in Tulsa on Juneteenth: report MORE. In it, McCain writes that the president seems to care more about “the appearance of toughness” than American values, chiding Trump's coziness with Russian President Vladimir Putin, in particular.

“The Restless Wave: Good Times, Just Causes, Great Fights, and other Appreciations.” will be released on May 22.