Former President Joe Biden announced Sunday that his battle with prostate cancer will limit his ability to promote his upcoming presidential memoir, Promise Me, America, which is scheduled to be released Nov. 17.

In a post on X, Biden said his condition has not prevented him from continuing his activities but sometimes slows him down. He explained that he would be unable to participate in as many public conversations about the book as he had originally planned, adding that he hopes its contents will speak for themselves.

Biden described the memoir as an account of his four years in the White House, including the challenges his administration faced, the decisions he made and the reasoning behind them. He also said the book examines America's role in the world and his faith in the country's founding principles and system of self-government.

The former president reflected on the nation's founding ideals in his announcement, writing that America was built around the belief that all people are created equal. He urged Americans not to lose sight of that principle.

Biden disclosed in May 2025 that he had been diagnosed with an aggressive form of prostate cancer that had spread to his bones. His son, Hunter Biden, provided a further update in August, saying the disease had metastasized beyond the bones and was causing his father significant pain and physical difficulties.

The announcement did not provide a detailed schedule of which promotional appearances would be canceled or changed. Biden said his doctors remained encouraged by his response to treatment, while acknowledging that some days are more difficult than others.

The memoir's Nov. 17 release will allow Biden to present his account of his presidency, including the major decisions and events that defined his administration.