If an “official act” is anything that happens while they’re in office, Biden should just shoot Trump on his last day in office. Following this argument, he’d be immune to prosecution.
A denial of criminal immunity would incapacitate every future president with de facto blackmail and extortion while in office, and condemn him to years of post-office trauma at the hands of political opponents.
It’s funny that this hasn’t happened in 45 presidencies, yet his argument is that it’s suddenly going to be a problem for every future president…