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Because "official actions" doesn't mean "every action" or "every action attempting to use presidential authority," I think it has to be an action exercising the constitutional powers of the president.
For instance: for the purposes of simplicity, lets assume all legislation authorizing the president to take military action without prior congressional approval has been repealed, and the congress has not declared war on anyone or authorized the use of military force in any circumstances. The president then orders Seal Team 6 to assassinate a waitress who spilled coffee on him, ruining his lucky suit. That would be illegal order since the president does not have constitutional authority to take such action on his own without authorization by congress and that authorization does not exist.
How can you prove beyond a reasonable doubt that there was no official basis for an act? Especially when the response is almost certainly going to be, "the reason for the official action is classified".
For example, the CEO hires their clueless spouse to a high paying job and the spouse loses the company a ton of money. That does not sound like the CEO was doing their job, but rather it sounds like they were putting their spouse ahead of the company. Here a lawsuit would certainly be allowed to go forward.
https://www.investopedia.com/terms/b/businessjudgmentrule.as...
In my hypothetical? Because there's no congressional declaration of war or authorization of the use military force against the waitress, which can be determined by reading the journals of the house and senate.