Could Trump use a mental health defense?

[The Velveteen Ocelot]

5. No. Obviously he's not all there, but an insanity defense is rarely successful

because the standard of proof is so demanding: Some states use the old M'Naughton test, which is whether the defendant knew the nature of the crime (the defendant cuts another person's throat under the delusion that he is cutting a loaf of bread), or understood the difference between right and wrong, morally or legally, at the time it was committed. In states that use the Model Penal Code rule, the defendant must have been diagnosed with a mental disease or defect, and either did not know right from wrong or lacked the ability to control an impulse that led to the crime.

In other words, you have to be as mad as a box of frogs, suffering from something like schizophrenia or some other really serious mental illness. Trump is a narcissist and an asshole and might be getting senile, but he's not crazy enough for an insanity defense. The fact that he tries to cover up or downplay his crimes is proof right there that he knows that what he's done is illegal.