Biden says he can’t do as many appearances for his new book as he had hoped due to cancer recovery

Former President Joe Biden said on Sunday he won't be able to participate in many events for his new memoir titled Promise Me, America that comes out on November 17.

Biden said the book covers his years as president, including the "challenges we faced, the decisions I made, and why I made them."

Biden also said it's about his faith in the American people and the "great American experiment" in self-governance and democracy.

"While writing the book, I was diagnosed with cancer, a disease known all too well to millions of Americans and their families. My doctors continue to be encouraged by how I've responded to treatment. And the prayers and kind words and well wishes from so many of you have meant more to me and Jill and our family than you can ever know," he wrote. 

"Some days are better than others. It hasn't stopped me. But sometimes it slows me down. What that means is, unfortunately, I won't be able to do as many conversations about my book as I'd hoped. However, I'm hopeful the words on the page speak for themselves," he added.

Biden continued, saying, "Looking forward, I'm going to keep following what my father told me a long time ago: 'Champ, when you get knocked down, get up.' It's a good lesson for me. And for America."

Biden said the U.S. is the most unique nation on earth. 

"Unlike other countries, we're built on an idea. An idea bigger than any ocean. More powerful than any army," he said. "Stronger than any tyrant or dictator. That idea? All of us are created equal. Promise Me, America, we'll never forget it."