The movie “Vice” explains well what this is about.
It’s was originally imploded by President George W Bush.
—-
SCOTUS essentially ruled in favor of this theory.
The notion that former heads of state have some sort of immunity for official acts is also common in developed countries: https://oxcon.ouplaw.com/display/10.1093/law-mpeccol/law-mpe...
“Functional immunity applies to both sitting and former heads of state; however, this immunity is available to such individuals solely with respect to acts performed in their official capacity (Fox 667).”
This notion is the core of the supreme court’s holding in this case.
Same question applies to either party when they push stuff like this.
Some are saying it is broader than it is because they want charges to be dismissed. Others are saying it's broader because they want a more powerful executive. Others are saying it try to make the court look bad, or to get votes. Some are saying it because they're mistaken / confused. On 4 out of 5 counts, the court remanded for further proceedings without deciding whether Trump has immunity. All of these voices could have easily come out with a different take, claiming victory and saying he will likely be convicted on most counts.
Major questions doctrine: Something conservatives on the Superme Court came up with to defeat any government action they don't like.