A very public threat like this is not intended for Iranians, but Americans. Trump is aware that many of his own citizens, having seen his kowtowing to Putin, increasingly consider him a doormat. He is thus trying to bolster his image as a tough guy by virtue-signalling strength.https://twitter.com/realDonaldTrump/status/1021234525626609666 …
I said he was for sale. I never said he was paid off by foreign governments (though this might also be true). And, though the summary you gave is an entertaining caricature, it is not incoherent enough to work as a reductio ad absurdum.
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Here's a better tinfoil theory for you: he talked with Putin about Iran and now feels comfortable taking a harder line with them because Russia has promised not to go too nuts about it.