Biden regrets dropping out of the presidential race & appointing Merrick Garland Attorney General. He has expressed no regrets over his support for genocide in Gaza, breaking his campaign promises re Covid & allowing it to spread out of control or his attacks on civil liberties which give Trump increased authoritarian powers.
https://www.theguardian.com/us-news/2024/dec/28/joe-biden-regrets-dropping-out-re-election?CMP=Share_AndroidApp_Other