Former US president Joe Biden said he won't be "able to have as many conversations" about his upcoming memoir as he would want to because of his cancer diagnosis.

Mr Biden said in a post on X that his memoir, Promise Me, America, is out on 17 November.

It covers his years as the 46th president, along with the decisions he made while Commander-in-Chief and the reasoning behind them, the 83-year-old said.

"It's about who we are as a nation," Mr Biden said.

"What we stand for. And America's role in the world. More than anything, it's about my faith in the American people and the great American experiment in self-governance and democracy."

In May 2025, Mr Biden revealed he had been diagnosed with one of the most aggressive forms of prostate cancer.

Just months after, it was reported Mr Biden also had surgery for skin cancer.

In his latest update on Monday, Mr Biden said that while working on his new book, he 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," the former president said.

Speaking of the toll the disease has been taking on him, Mr Biden added: "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."

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Mr Biden's four years in power ended in January 2025 when President Trump took over after defeating his would-be successor, Kamala Harris.

The final year of his presidency was beset by concerns over his physical health and mental acuity, culminating in a disastrous TV debate that saw him eventually step back as candidate.

(c) Sky News 2026: 'Some days are better than others': Joe Biden scales back book tour as he reveal