Biden's aides said his debate performance was poor because he struggles to function after 4 p.m., report says

• Joe Biden's aides defended his debate performance, citing his limited optimal hours, Axios said.
• Biden performs best between 10 a.m. and 4 p.m., his aides told the publication.
• Some blamed his performance on overpreparation by aides, The Washington Post reported.

President Joe Biden's aides have defended his debate performance, saying he struggles to function outside a six-hour window during the day, Axios reported.