Decency, integrity, and the other one.

(critieria) of someone with Narcissistic Personality Disorder...which I've linked. Here is the DSM-5 section on NPD...see how many of those criteria match the decades of observed...and documented...Trump behavior.

While it is normal practice to personally meet with and interview a patient before arriving at a diagnosis...when there are literally several decades of documented observations and the opportunity to interview first person accounts of witnesses to that behavior, the sheer volume of data can allow for such a diagnosis by hundreds of Mental Health Professionals.
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Narcissistic Personality Disorder
Diagnostic Criteria 301.81 (F60.81)

A pervasive pattern of grandiosity (in fantasy or behavior), need for admiration, and lack
of empathy, beginning by early adulthood and present in a variety of contexts, as indicated
by five (or more) of the following:
1. Has a grandiose sense of self-importance (e.g., exaggerates achievements and talents,
expects to be recognized as superior without commensurate achievements).
[e.g. Trump brags that he knows more than Generals when it comes to making Military decisions.]
2. Is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal
love.
[e.g. Trump needs to be on the cover of Time Magazine...a lot...artificially tans his skin...all the time...claims he's a brilliant Ivy League student...but threatens to sue any school he attended if they talk about his performance...etc.]
3. Believes that he or she is “special” and unique and can only be understood by, or
should associate with, other special or high-status people (or institutions).
4. Requires excessive admiration.
[e.g. numerous examples of Trump demanding Loyalty...and only elevating those who say "Nice Things" about him]
5. Has a sense of entitlement (i.e., unreasonable expectations of especially favorable
treatment or automatic compliance with his or her expectations).
[e.g. Laws don't apply to him...like taking, hiding and obstructing the return of, highly classified documents upon leaving office.]
6. Is interpersonally exploitative (i.e., takes advantage of others to achieve his or her own
ends).
[e.g. The Prime Example is Trump lying to his followers and getting them to attack the Capitol on Jan. 6th...then end up going to prison, or even killed (e.g. Ashley Babbitt) just to keep HIM in power]
7. Lacks empathy: is unwilling to recognize or identify with the feelings and needs of others.
[e.g. Trump mocking reporter with disabilities...tossing paper towels to hurricane victims...telling a Gold Star Mom that her son "Knew what he signed up for"...watching and doing nothing about the attacks on D.C. Capitol Police Officers...approving of the permanent separation of immigrant children from their parents during his "Zero Tolerance" campaign...etc., etc.]...also shows "Sociopathic" behavior, which brings in the "Malignancy" aspect]
8. Is often envious of others or believes that others are envious of him or her.
[e.g. Obama...Dr. Fauci...or anyone who gets more praise than he does...]
9. Shows arrogant, haughty behaviors or attitudes.
[e.g. Trump "Shoving" other dignitaries aside at an international gathering so that he can get to the front of a photo op]

Diagnostic Features
The essential feature of narcissistic personality disorder is a pervasive pattern of grandi-
osity, need for admiration, and lack of empathy that begins by early adulthood and is pres-
ent in a variety of contexts.

Individuals with this disorder have a grandiose sense of self-importance (Criterion 1).
They routinely overestimate their abilities and inflate their accomplishments, often appearing
boastful and pretentious. They may blithely assume that others attribute the same value to
their efforts and may be surprised when the praise they expect and feel they deserve is not
forthcoming. Often implicit in the inflated judgments of their own accomplishments is an un-
derestimation (devaluation) of the contributions of others. Individuals with narcissistic per-
sonality disorder are often preoccupied with fantasies of unlimited success, power, brilliance,
beauty, or ideal love (Criterion 2). They may ruminate about “long overdue” admiration and
privilege and compare themselves favorably with famous or privileged people.

Individuals with narcissistic personality disorder believe that they are superior, spe-
cial, or unique and expect others to recognize them as such (Criterion 3). They may feel
that they can only be understood by, and should only associate with, other people who are
special or of high status and may attribute “unique,” “perfect,” or “gifted” qualities to those
with whom they associate. Individuals with this disorder believe that their needs are spe-
cial and beyond the ken of ordinary people. Their own self-esteem is enhanced (i.e., “mir-
rored”) by the idealized value that they assign to those with whom they associate. They are
likely to insist on having only the “top” person (doctor, lawyer, hairdresser, instructor) or
being affiliated with the “best” institutions but may devalue the credentials of those who dis-
appoint them.

Individuals with this disorder generally require excessive admiration (Criterion 4). Their
self-esteem is almost invariably very fragile. They may be preoccupied with how well they
are doing and how favorably they are regarded by others. This often takes the form of a need
for constant attention and admiration. They may expect their arrival to be greeted with great
fanfare and are astonished if others do not covet their possessions. They may constantly fish
for compliments, often with great charm. A sense of entitlement is evident in these individ-
uals’ unreasonable expectation of especially favorable treatment (Criterion 5). They expect
to be catered to and are puzzled or furious when this does not happen. For example, they
may assume that they do not have to wait in line and that their priorities are so important
that others should defer to them, and then get irritated when others fail to assist “in their
very important work.” This sense of entitlement, combined with a lack of sensitivity to the
wants and needs of others, may result in the conscious or unwitting exploitation of others
(Criterion 6). They expect to be given whatever they want or feel they need, no matter what
it might mean to others. For example, these individuals may expect great dedication from
others and may overwork them without regard for the impact on their lives. They tend to
form friendships or romantic relationships only if the other person seems likely to advance
their purposes or otherwise enhance their self-esteem. They often usurp special privileges
and extra resources that they believe they deserve because they are so special.

Individuals with narcissistic personality disorder generally have a lack of empathy and
have difficulty recognizing the desires, subjective experiences, and feelings of others (Crite-
rion 7). They may assume that others are totally concerned about their welfare. They tend to
discuss their own concerns in inappropriate and lengthy detail, while failing to recognize
that others also have feelings and needs. They are often contemptuous and impatient with
Narcissistic Personality Disorder 671

others who talk about their own problems and concerns. These individuals may be oblivious
to the hurt their remarks may inflict (e.g., exuberantly telling a former lover that “I am now
in the relationship of a lifetime!”; boasting of health in front of someone who is sick). When
recognized, the needs, desires, or feelings of others are likely to be viewed disparagingly as
signs of weakness or vulnerability. Those who relate to individuals with narcissistic person-
ality disorder typically find an emotional coldness and lack of reciprocal interest.

These individuals are often envious of others or believe that others are envious of them
(Criterion 8). They may begrudge others their successes or possessions, feeling that they better
deserve those achievements, admiration, or privileges. They may harshly devalue the contri-
butions of others, particularly when those individuals have received acknowledgment or
praise for their accomplishments. Arrogant, haughty behaviors characterize these individuals;
they often display snobbish, disdainful, or patronizing attitudes (Criterion 9). For example, an
individual with this disorder may complain about a clumsy waiter’s “rudeness” or “stupidity”
or conclude a medical evaluation with a condescending evaluation of the physician.

Associated Features Supporting Diagnosis
Vulnerability in self-esteem makes individuals with narcissistic personality disorder very
sensitive to “injury” from criticism or defeat. Although they may not show it outwardly,
criticism may haunt these individuals and may leave them feeling humiliated, degraded,
hollow, and empty. They may react with disdain, rage, or defiant counterattack. Such ex-
periences often lead to social withdrawal or an appearance of humility that may mask and
protect the grandiosity. Interpersonal relations are typically impaired because of problems
derived from entitlement, the need for admiration, and the relative disregard for the sen-
sitivities of others. Though overweening ambition and confidence may lead to high
achievement, performance may be disrupted because of intolerance of criticism or defeat.
Sometimes vocational functioning can be very low, reflecting an unwillingness to take a
risk in competitive or other situations in which defeat is possible. Sustained feelings of
shame or humiliation and the attendant self-criticism may be associated with social with-
drawal, depressed mood, and persistent depressive disorder (dysthymia) or major de-
pressive disorder. In contrast, sustained periods of grandiosity may be associated with a
hypomanic mood. Narcissistic personality disorder is also associated with anorexia ner-
vosa and substance use disorders (especially related to cocaine). Histrionic, borderline,
antisocial, and paranoid personality disorders may be associated with narcissistic person-
ality disorder.

Prevalence
Prevalence estimates for narcissistic personality disorder, based on DSM-IV definitions,
range from 0% to 6.2% in community samples.

Development and Course
Narcissistic traits may be particularly common in adolescents and do not necessarily in-
dicate that the individual will go on to have narcissistic personality disorder. Individuals
with narcissistic personality disorder may have special difficulties adjusting to the onset of
physical and occupational limitations that are inherent in the aging process.

Gender-Related Diagnostic Issues
Of those diagnosed with narcissistic personality disorder, 50%–75% are male.

Differential Diagnosis
Other personality disorders and personality traits. Other personality disorders may
be confused with narcissistic personality disorder because they have certain features in
common. It is, therefore, important to distinguish among these disorders based on differ-
ences in their characteristic features. However, if an individual has personality features
that meet criteria for one or more personality disorders in addition to narcissistic person-
ality disorder, all can be diagnosed. The most useful feature in discriminating narcissistic
personality disorder from histrionic, antisocial, and borderline personality disorders, in
which the interactive styles are coquettish, callous, and needy, respectively, is the grandi-
osity characteristic of narcissistic personality disorder. The relative stability of self-image
as well as the relative lack of self-destructiveness, impulsivity, and abandonment concerns
also help distinguish narcissistic personality disorder from borderline personality disor-
der. Excessive pride in achievements, a relative lack of emotional display, and disdain for
others’ sensitivities help distinguish narcissistic personality disorder from histrionic
personality disorder. Although individuals with borderline, histrionic, and narcissistic
personality disorders may require much attention, those with narcissistic personality dis-
order specifically need that attention to be admiring. Individuals with antisocial and nar-
cissistic personality disorders share a tendency to be tough-minded, glib, superficial,
exploitative, and unempathic. However, narcissistic personality disorder does not neces-
sarily include characteristics of impulsivity, aggression, and deceit. In addition, individu-
als with antisocial personality disorder may not be as needy of the admiration and envy of
others, and persons with narcissistic personality disorder usually lack the history of con-
duct disorder in childhood or criminal behavior in adulthood. In both narcissistic person-
ality disorder and obsessive-compulsive personality disorder, the individual may profess
a commitment to perfectionism and believe that others cannot do things as well. In con-
trast to the accompanying self-criticism of those with obsessive-compulsive personality
disorder, individuals with narcissistic personality disorder are more likely to believe that
they have achieved perfection. Suspiciousness and social withdrawal usually distinguish
those with schizotypal or paranoid personality disorder from those with narcissistic per-
sonality disorder. When these qualities are present in individuals with narcissistic person-
ality disorder, they derive primarily from fears of having imperfections or flaws revealed.
Many highly successful individuals display personality traits that might be considered
narcissistic. Only when these traits are inflexible, maladaptive, and persisting and cause
significant functional impairment or subjective distress do they constitute narcissistic per-
sonality disorder.

Mania or hypomania. Grandiosity may emerge as part of manic or hypomanic episodes,
but the association with mood change or functional impairments helps distinguish these
episodes from narcissistic personality disorder.

Substance use disorders. Narcissistic personality disorder must also be distinguished
from symptoms that may develop in association with persistent substance use.
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Note also, that Donald Trump's niece, Mary Trump, who is a Psychologist, documents in a book of hers that DJT is indeed a Narcissist...and she has first hand experience in dealing with him, so her diagnosis counts as well.

Link: https://repository.poltekkes-kaltim.ac.id/657/1/Diagnostic%20and%20statistical%20manual%20of%20mental%20disorders%20_%20DSM-5%20(%20PDFDrive.com%20).pdf

It might help.