Cancer touches us all, says Biden after outpouring of support

"Cancer touches us all," Biden wrote on social media on Monday morning. "Like so many of you, Jill and I have learned that we are strongest in the broken places. Thank you for lifting us up with love and support."

On Sunday, Biden's office disclosed that he was diagnosed with an aggressive form of prostate cancer that has spread to his bones.

The news comes as fresh questions are being raised about the former president's health while he was in office.

"On Friday, he was diagnosed with prostate cancer, characterised by a Gleason score of 9 (Grade Group 5) with metastasis to the bone," Biden's office said in a statement.

"While this represents a more aggressive form of the disease, the cancer appears to be hormone-sensitive which allows for effective management."

A Gleason score of nine means his illness is classified as "high-grade" and the cancer cells could spread quickly, according to Cancer Research UK.