If you take a look at narcissist personality disorder you get a lot of explanations. One symptom being super arrogant.

See the podcasts and book edited by Dr Bandy Lee. It's been widely discussed & documented. See also Dr Stephen Hassan who helps folks leave cults.

It's too bad Pelosi forbid her from speaking to Congress. It would have been helpful. I'd also wished the Dems would have addressed the fact almost half of the US are brainwashed cult followers. They acted liked it's not even a problem, but it's the worst problem we have & we're ignoring it.

Excellent question.

I don't think he's insane, he is however a genuine malignant narcissist. He's so in love with himself he truly believes he is a genius and can do no wrong.

Various psychiatrists have reported major concerns, but they get in trouble for not examining him in person. Still enough of his life is on video for a pretty damming picture. The answer is you will never get a clinical diagnosis, and even if you had one, I'm not sure the republicans would act.

He's probably too old for a definitive diagnosis. You'd have to be able to separate life-long issues from recent brain issues.

huh?

Many of the republicans in dc know full well Trump is a lunatic. They aren't there for him.. Look at all the payoffs, in high level Govt jobs, he makes to people for being loyal. Power and $ ... even for drunken dopes like Hegseth.

Doesn't need a clinical diagnosis, just needs Vance to step up, which he won't. constitution.congress.gov/constitution...

Of course Republicans won't act to stop him, he's their gravy train.

I'm not a doctor but pretty sure he is insane.

King of Hearts movie comes to life. #Resist

You could see what he does and hear what he says. That’s how I know.

Without snark or sarcasm, as a research psychologist, I assure you that trained observers could (and have) evaluated his actions and words to determine if they agree with recognized psychological maladies, as described in the DSM. It's no different than diagnosing any other medical issue.

Being "insane" is not a clinical diagnosis. However, he clearly suffers from multiple personality disorders, and the two dominating ones are Narcissistic personality disorder (NPD) and Antisocial personality disorder (ASPD). He fits into the vulnerable variety of NPD.