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Donald Trump appears to be exhibiting many of the outward characteristics of Narcissistic Personalty Disorder (NPD). NPD is a defect in oneâs personality that manifests as an excessive mental preoccupation with oneself â usually to the detriment of everyone else.
The law defines the following conditions as a serious mental illness: 1  Schizophrenia. 2  Paranoid and other psychotic disorders.  Bipolar disorders (hypomanic, manic, depressive, and mixed)