Trump's delusional disorder explained
The avenue for mental health defense is still open for Donny: Early symptoms may include the feeling of being exploited, preoccupation with the loyalty or trustworthiness of friends, a tendency to read threatening meanings into benign remarks or events, persistent bearing of grudges, and a readiness to respond to perceived slights.
Symptoms include:
Grandiose: Patients believe they have a great talent or have made an important discovery.
Persecutory: Patients believe that they are being plotted against, spied on, maligned, or harassed. They may repeatedly attempt to obtain justice through appeals to courts and other government agencies and may resort to violence in retaliation for the imagined persecution.
http://www.msdmanuals.com/professional/psychiatric-disorders/schizophrenia-and-related-disorders/delusional-disorder
If these signs continue for 30 days or more the person should seek treatment.