Presidential Immunity Let's Know Things

This week we talk about diplomatic immunity, Trump’s court cases, and the Supreme Court.
We also discuss Nixon, Clinton, and the US Constitution.
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Transcript
There's a concept in international law—diplomatic immunity—that says, in essence, certain government officials should be immune from the laws of foreign countries, including those within which they're operating.
This is a very old concept, based on similar rights that were granted to envoys and messengers back in the oldest documented periods of human civilizations.
The idea is that if different cultures, whether organized into tribes or kingdoms or nation states, are going to be able to deal with each other, they need to maintain open and reliable means of communication. Thus, the folks tasked with carrying messages between leaders of these different groups would need to be fairly confident that they wouldn't be hassled or attacked or prosecuted by the people they were bringing those messages to, and whose messages they were bringing back to their own leaders.
Such representatives have at times been imprisoned or killed by their hosts, but this is relatively rare, because any governing body that treated ambassadors from other cultures in this way would have trouble dealing with anyone outside their current legal sway, and that would in turn mean less trade, less reliable peace, and less opportunity to generally cross-pollinate with cultures they might benefit from cross-pollinating with.
As a general rule, at least in the modern iteration of diplomatic immunity, folks operating under the auspices of this policy can still be punished for their misdeeds, it's just that they'll generally be declared persona non grata, expelled from the country where they did something wrong, rather than punished under that country's laws.
In some rare instances a country hosting a misbehaving or criminal ambassador or other diplomat might ask that person's home country to waive their immunity, basically saying, look, this person killed someone or got drunk and drove recklessly through our capitol city's downtown, we'd like to try them in our courts, and it may be that the government running that misbehaving person's home country says, okay, yeah, that's messed up, you go ahead; but usually—even if that person has done something truly reprehensible—they'll instead say, no, sorry, we'll pull them back and they won't be allowed to return to your country or serve as an ambassador anywhere else, because they've shown themselves to be unreliable, and we might even try them in a court here, in their home country, but we can't allow our people, no matter what they do, to fall under the legal jurisdiction of some other nation, because that would set a bad precedent, and it may make people wary of working for us in this capacity in the future—surely you understand.
There are tiers of diplomatic immunity, depending on the seniority of the diplomat or other representative in question, and the Congress of Vienna of the early 1800s charted out the basis for how these things work, in much detail, formalizing a lot of what was already in the ether back then, and creating an outline that was then further formalized in 1961's Vienna Convention on Diplomatic Relations, which has been almost universally ratified and respected, though of course there's been a lot of grey area in terms of what harassment of a representative, which is a no-no according to this convention, entails, and to what degree it can be proven, and thus punished, if violated.
We saw a lot of grey area utility during the height of the Cold War in particular, in part because many diplomats were moonlighting as spies, which is still true today, though it was even more overt and worrisome to their host countries, back then, so harassment, kidnappings, even assassinations of diplomats were more common then, t