@cnn: Former President Joe Biden announced that he "won't be able to do as many conversations" about his upcoming presidential memoir due to his cancer. "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 wrote on social media. Biden's book, titled "Promise Me, America," is slated for release on November 17. 📸: Leah Millis/Reuters/File