A new book, detailing the inner workings of the Biden White House and campaign as it defended his mental acuity, labeled deputy press secretary the "tip of the spear."

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.

After mislabeling Biden's stage 4 prostate cancer diagnosis as "stage 9," which does not exist, Trump again raised questions about the former president's cognitive health

Tapper's book, co-authored by Alex Thompson, describes a president who struggled to function: "One person told us that the presidency was, at best, a five-person board with Joe Biden as chairman."