Kamala Harris has sharply criticized Joe Biden's decision to seek re-election, branding it as "recklessness" in excerpts from her forthcoming memoir, "107 Days." She revealed that the then-81-year-old Biden became "tired" and prone to stumbles, which showed his age, and also accused White House staff of hindering her.

• Kamala Harris called Joe Biden's re-election bid "recklessness."
• The memoir, "107 Days," covers her 107-day presidential campaign after Biden dropped out.
• Harris accused White House staff of failing to support her and actively hindering her during her vice presidency.