Transcript for McCain doesn't hold back on Trump in memoir

today. Mary, we also have an update on Arizona senator John McCain as he battles brain cancer. He says he's facing an unpredictable predicament. He is in stable condition we're told at home in Arizona but he is blunt in saying that he doesn't know how much time he has left and now he's tackling some unfinished business. I have some things I'd like to take care of first, some work that needs finishing and some people I need to see. Reporter: Those people include former vice president Joe Biden, who recently visited McCain at home in Arizona. Biden telling "The New York Times" I wanted to let him know how much I love him. I wanted to see my friend. With speculation swirling that Biden could make another run for the white house, McCain reportedly told him to not walk away from politics. As he battles brain cancer the Republican senate titan is coming to terms with his past and his future. His son-in-law speaking out on Sunday. He's had a pretty amazing run. The fact is he's very grateful for the chances and fortune he's experienced in life and reflecting at the end on a lot of different things. Reporter: In his new memoir "The restless wave" he says he regrets not picking Joe Liberman as his running mate in 2008 and picking Sarah Palin instead and shares his hopes for our country's future. I'd like to see us recover our sense that we are more alike than different. Whether we think each other right or wrong in our views on the issues of the day, we owe each other our respect. Reporter: He is not holding back from criticizing president trump either and is reportedly telling friends that he does not want the president to attend his funeral. That instead he would prefer if vice president pence came instead. Thank you, Mary. Michael. Thank you, robin.

This transcript has been automatically generated and may not be 100% accurate.