Insightful videos by Peter Doocy raise questions about Joe Biden's mental acuity and media's reluctance to address his health concerns.

Democratic Delaware Sen. Chris Coons struggled on Fox News Wednesday to defend his past confidence in former President Joe Biden’s mental acuity as he dodged direct questions about whether he regrets misleading the public.

In a copy of “Original Sin” obtained by ABC News, journalists Jake Tapper and Alex Thompson allege Joe Biden hid info about his son Beau's cancer diagnosis.

Biden was treated for a blood clot in his lung in 1988, per The Washington Post. The clot came one month after the then-senator underwent emergency surgery for the first aneurysm. At the time, bed rest following the surgery was thought to have led to the subsequent clot.

After a stretch of limited public appearances since leaving office, former President Joe Biden’s cancer diagnosis arrived amid heightened scrutiny of his cognitive health.

Tapper told Kelly he felt “tremendous humility” about his past coverage of former President Joe Biden’s mental acuity.

United States President Donald Trump fueled speculation on Monday that Joe Biden's cancer diagnosis was covered up, saying he was "surprised" the public was not told about his predecessor's condition earlier.