The revelation of former President Joe Biden’s cancer diagnosis has seemed to halt the ongoing debate over his fitness for office. But the co-author of the new book “Original Sin” tells Variety that conversation is fair,

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.

The release this month of Original Sin, the latest in a series of books on the run-up to last year’s presidential election, has added to the soul-searching, with journalists Jake Tapper and Alex Thompson’s damning warts-and-all portrayal raising questions over Biden’s mental and physical acuity and his inner circle’s efforts to shield him from scrutiny.