Experts say they understand that the circumstances might prompt fear and suspicion, but they’re also not unheard-of.

Joe Biden informed the nation of his diagnosis of prostate cancer.

Prostate cancer experts say that Mr. Biden’s diagnosis is serious, and that once the cancer has spread to the bones — where it tends to go — it cannot be cured.

Jake Tapper and Alex Thompson's book has already generated a national debate about whether the White House deceived the public about the president's cognitive state and how Biden's late exit from the race undermined the Democratic Party's chances of stopping Trump.