In his latest book, Republican Sen. John McCain opens up about how he honestly feels about the current political state of America, reports CNN. 

His book, The Restless Wave: Good Times, Just Causes, Great Fights, and Other Appreciations releases May 22. He co-authored with former adviser Mark Salter, and Apple released an excerpt of the book on Monday.

McCain wrote: "This is my last term. If I hadn't admitted that to myself before this summer, a stage 4 cancer diagnosis acts as ungentle persuasion. 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."

McCain, 81, is currently healing from brain cancer in his home state Arizona. He wrote that he would like to see the country's politics be filled with purpose.

"I would like to see us recover our sense that we are more alike than different," he wrote. "We are citizens of a republic made of shared ideals forged in a new world to replace the tribal enmities that tormented the old one. Even in times of political turmoil such as these, we share that awesome heritage and the responsibility to embrace it."

In a critique of President Trump, McCain said: "He has declined to distinguish the actions of our government from the crimes of despotic ones. The appearance of toughness, or a reality show facsimile of toughness, seems to matter more than any of our values."

He also wrote that he lived a love filled life and doesn't have any regrets.

"The world is a fine place and worth the fighting for and I hate very much to leave it,' spoke my hero, Robert Jordan, in For Whom the Bell Tolls," McCain said. "And I do, too. I hate to leave it. But I don't have a complaint. Not one. It's been quite a ride. I've known great passions, seen amazing wonders, fought in a war, and helped make a peace. I made a small place for myself in the story of America and the history of my times."