The announcement Sunday that former President Joe Biden was diagnosed with advanced prostate cancer has some people wondering how the disease could have been missed.

Former U.S. President Joe Biden's cancer announcement revived questions on Monday about the extent of his health issues during his tenure, with President Donald Trump saying Biden should have been more transparent with the public.

The news that former President Joe Biden has been diagnosed with an "aggressive" form of prostate cancer has raised fresh questions about his White House's transparency. Biden's office said in a statement on Sunday that he was diagnosed with prostate cancer on Friday, with the cancer cells having spread to the bone.