What a pussy ass copout. There is no clause in the Constitution, and although stare decisis over the last 150 years have resulted in "qualified immunity" for the executive office, there has never been a court decision granting total immunity to the president, and it is just plain stupid, and actually insulting to anyone with intelligence, to imply that there is.
You could have mentioned Nixon v. Fitzgerald, or even Clinton v. Jones. Department of Justice memorandums from 1973 and 2000, both indicating an unwillingness to criminally prosecute a sitting president--got that, a sitting president. Both those memorandums have laid down the rules that have dictated justice department behavior for more than twenty years.
To put it simply, a president cannot be prosecuted for criminal actions he engages in, while president, and while performing his duties. And he has great leeway in the definition of his "duties". But the moment he leaves office, that "qualified immunity" evaporates. Rather it is via impeachment, resignation, or end of his term.
Trump is claiming total immunity. He claims no president can be punished for criminal actions while they are president. Doesn't have to do with the performance of their duties. And when they leave office, well they can't be prosecuted
It is funny really. All those people Bill Clinton had killed while he was president, according to Trump, well he had immunity, so why the hell did all you Republican turds bitch about it. Biden, while VP, accepting all those bribes and shit, well if the executive office enjoys total immunity, the VP is part of the executive office. He gets it too.
Trump is a very sick man. He's a mental health case.