During the late stages of Nixon's presidency, they hit upon a negotiating gambit called the Madman Theory. The idea was to convey to the Vietnamese that Nixon had lost his mind and could start nuking North Vietnam in his madness. The idea was the force the North Vietnamese to accept a timetable that would allow the US to leave Vietnam and not have the sort of chaos that we saw, for instance, when we evacuated Kabul. Didn't work, but there was at least a gap.
When you read Richardson or Aaron Rupar's transcription of Trump's inane babblings, it's tempting to see this as a reinvigoration of the Madman Gambit. The problem is, it seems far more likely that he really is fucking bonkers. The insane tableau of Trump mumbling about Iran with the Easter Bunny standing next to him while kids wait to do an Easter egg roll is...I don't think we have the words to describe it. If he's faking it, we can skip his quest for the Nobel Prize and give him an Oscar.
Garrett Graff and Martin Longman concur that nuclear weapons are likely not off the table. That doesn't mean that Trump's current rhetorical escalation should be taken at face value. His threats to end Iranian civilization could mean just further bluster in an attempt to bring them to the table or the crazy son of a bitch could be considering nuclear weapons. I personally doubt it, because he's expressed a certain fear of the awfulness of nuclear weapons, but he really seems deranged and certainly creatures like Pete Hegseth are not going to rein him in.
Is there someone around him who can impress upon him that he will become a Hitler-level monster if he launches nukes at Iran? Would he care? I think - possibly - he might. But this is a guy who wanted to nuke North Korea in 2017 and a hurricane shortly thereafter.
If only America had a separate branch of government, say a legislature, some sort of Congress, we might be spared this looming tragedy.