Former US president Joe Biden expressed gratitude Monday for an outpouring of "love and support" following his cancer diagnosis, even as some in President Donald Trump's orbit leveled fresh accusations of a health cover-up.

The 82-year-old ex-president's shock announcement on Sunday that he had been diagnosed with an aggressive form of prostate cancer sparked an outpouring of good wishes, including from Trump himself, Biden's vice president Kamala Harris and ordinary Americans.

"Cancer touches us all. Like so many of you, Jill and I have learned that we are strongest in the broken places," Biden said on social media, including a photo of him and former first lady Jill Biden.

"Thank you for lifting us up with love and support."

Biden's office said in a statement that he had been diagnosed Friday following the discovery of a prostate nodule, and that the cancer had spread to the bone.

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

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