If the man is not full blown mentally ill - he is far far down that path.
The Diagnostic and Statistical Manual (DSM - 5, Cluster B) for “Narcissistic Personality Disorder” by The American Psychiatric Association (APA) tells us the following about an indentified mental condition.
Here, according to The APA, are the 9 criteria for “Narcissistic Personality Disorder”. If an individual has 5 out of the 9 they have a confirmed diagnosis of this illness. Many individuals have “traits” of narcissism but only about 1% of the population has clinical NPD.
What does it mean if someone does have NPD?
If someone does have “Narcissistic Personality Disorder” they can, indeed, wake up, see a Tweet or a news report from a foreign leader criticizing him, mocking him, calling him “weak” or threatening his ego in any way and order some kind of impulsive, vindictive, punishing, immediate response that could include an unhinged order to attack that foreign leader or foreign country with military force, even including the authorization of nuclear weapons.
It is extremely likely that there would be some kind of impulsive, angry diplomatic response.
Because someone afflicted with this incurable and progressive “Narcissistic Personality Disorder” simply can’t help himself.
We should be afraid ... we should be very afraid. Having a president - with all his powers - who has a mental illness which could manifest itself in any number of terrible ways hurting our nation, out people and possibly the rest of the world is a problem that we have not encountered before.