It’s not really something you can or cannot concede to, unless you are of the opinion America is the only sovereign state in the world.
Of course, that doesn't necessarily tell us anything about whether it's good or bad. Eroding Westphalian sovereignty in such a sense is the whole point of the ICC, the EU, and arguably even the UN (though, of these three, only the ICC would have the particular result described in my previous paragraph). But it's worth pointing out that it's a major difference from centuries of historical precedents, not American exceptionalism.
Now, 20 years from now? 30 years from now? 50? Who knows.
They would not have to. It will be up to your military to come to allied country and shoot their way through. This might be physically possible but I would imagine that the consequences of it to the standing of the US would be cataclysmic. So unless it is a former president I suspect the US will rather use some severe sanctions and still risk a payback.
Should the Marine Corps. actually be put into a position to roll in and say “hi” to the people of The Hague for less than peaceful purposes on their leisurely stroll to the ICC’s courthouse, who in their right minds is also going to stand in their way and exchange fire?
Not to mention that whoever arrested the President has now effectively declared war on the United States.
I already said "...someone who is not the president, sitting of former....". You are just repeating.
In a similar vein, Poland has said Netanyahu would have been welcome to visit the liberation of Auschwitz, without having to worry about out any arrest.
Depending on how Hungary’s actions are resolved, the ICC will lose much of it’s use if member states just ignore the treaty.
Hungary though technically still a party, is withdrawing from the Rome Statute: https://www.reuters.com/world/hungarian-lawmakers-approve-bi...