This is an expansion of a list presented originally by Steven Colbert on the "Late Show." His contributions (often reworded) are shown as "(C)", and modifications to his contributions are labeled "(C+)". Some of Colbert's frivolous examples, placed on his list for comedic effect, have been omitted.
My title uses the term "unfit". For many of these examples, "unsuitable" might be better than "unfit," although in fact far too many may best be described as "disqualifying" for the presidency. There may be some logical overlapping in these entries, but each has at least enough distinctiveness to warrant separate enumeration. There are "only" around 150 examples as my memory has greatly deteriorated, so perhaps the DKos community can make up the deficit in the comments section.
- kidnapped immigrant children and put them in cages (C)
- expresses love and admiration for dictators
- threatened to jail political opponents (C)
- expressed approval of various suggestions that he illegally extend the term of his office
- not exonerated from obstruction of justice by Mueller Report
- refuses to honor lawful subpoenas from Congress
- threatened to dump asylum seekers on sanctuary cities
- offered to pardon someone in advance if carrying out his instructions violated the law
- sides with dictators over US intelligence (C)
- calls the free press "the enemy of the people" (C)
- threatened to close the border with Mexico
- according to the NYT, he cheated on his taxes, a felony
- is a felon (at the very least tax fraud) and an unindicted co-conspirator in a campaign finance crime (C+)
- is attempting to destroy the Affordable Care Act in court
- claimed that he could sexually assault women because his celebrity status gave him impunity
- numerous sexual assault allegations (C)
- mishandled the disaster in Puerto Rico (C+)
- pulled out of the Paris Climate Agreement
- buried a report on climate change (C)
- pulled out of the Iran deal
- threatens to leave NATO
- threatens to close down the Mexican border
- insults allies (C)
- tried to fire the Special Counsel Robert Mueller
- fired FBI Director Comey over "this Rusher thing."
- dictated the first misleading statement about his son's 2016 meeting with Russians at Trump Tower (C)
- cut off aid to the Latin Triangle countries
- paid $2 million to N. Korea to release comatose hostage Otto Warmbier.
- calls African nations "shit hole countries" (C)
- can't pronounce the names of certain well known nations
- evaluated by some psychiatrists as being pre-dementia
- clear narcissistic and sociopathic tendencies
- an incompetent business man: Failures: Trump Airlines, Trump Casinos, Trump Mortgage, Trump University, Trump Vodka; four bankruptcies; $1,170,000,000 in lost revenue, 1985-1994 ("Mr. Trump appears to have lost more money than nearly any other individual American taxpayer")
- the most corrupt administration to date
- surrounded by convicted criminals (C)
- paid off a porn star and a playboy model (C)
- beloved by white supremacists
- approvingly quoted or re-tweeted Mussolini and other fascists
- called Nazis "very fine people" (C)
- endorsed Roy Moore (C)
- tried to ban Muslims (C)
- waging a tariff war on both friend and foe
- declared a non-existent national emergency
- attempts to divert funds to the wall project after Congress refused to finance it
- accepts emoluments
- refuses to properly divest himself from his business
- refused to condemn MBS for the murder of Khashoggi
- suggested that the police should be rough with suspects, and expressed regret that our military can't act like a real (lethal) military at the border
- denigrates Gold Star families
- has rarely if ever criticized Putin
- spoke for an hour with Putin and never brought up the matter of election interference
- forces cabinet members to express degrading and obsequious praise for him in public
- sets a bad dietary example
- fat
- falsifies elements of his annual physical exams
- gave himself a massive tax break by radically lowering the tax rate of people in his own tax bracket
- his tax cuts greatly contributed to our nation's gross income inequality and national debt
- made unilateral concessions to North Korea
- doesn't fire people directly, but has others do it for him
- highest turn-over rate of any president (C+)
- often makes major policies and policy shifts without consultation or informing those affected
- often makes major policies and policy shifts via Twitter
- undermines his own White House staff ("throwing them under the bus")
- spends "executive time" watching TV and starts his work day late
- golfs and vacations more than any president in history
- guilty of serious security lapses at his Florida resort home
- a troika of oligarchs (his personal friends) are running the VA
- willfully failed to fulfill a major promise of infrastructure renovation
- makes up degrading nicknames for people who oppose him
- attacks private citizens on Twitter (C)
- attacks comedians on Twitter and suggests that their shows "should be looked into" (C+)
- wandering, meandering, incoherent, and contradictory public diatribes
- rabble rousing
- encourages violence against certain opponents
- made a veiled threat against the left based on his support by military personnel, the police, and bikers
- desired to have a massive (and expensive) military parade
- demands personal loyalty from candidates for jobs that require independence from the Office of the President
- often views criticism directed against him as tantamount to treason or sedition
- sent the military to the border as a campaign stunt to stop a non-existent "caravan"
- signed numerous executive orders advancing the cause of polluters
- goes back on his stated public word, making it impossible to negotiate with him
- is never self-critical or self-deprecating; cannot make or take a joke about himself
- is an aristocrat (holds his social status as a result of inheriting a fortune)
- nepotism
- cheats at golf and other activities
- falsely makes claims of athletic prowess, including false claims of holding championship titles
- takes credit for the achievements of others
- picks unqualified people for important posts in the government
- fails to fill large numbers of open government posts
- fills important posts with acting heads in order to circumvent the approval of Congress
- violates long established norms of presidential behavior and the exercise of power
- below average intelligence (C)
- claimed to be a "very stable genius" (C)
- extremely ignorant and claims that "most people don't know" certain familiar facts
- presents himself as strong, but often exhibits weakness
- claims to love and respect the Bible and God, but evinces a complete lack of knowledge or belief in either
- engages in strange behaviors during his own speeches, like "snorting" and applauding himself
- an explicit source of inspiration for those who attempt, or execute, mass murders based on bigotry
- uses an unsecured phone
- revealed information to the Russians that exposed one of our spies
- insults the intelligence community (C)
- unduly influenced in policy and appointments by conservative media figures
- believes in hurting family members to get at perceived enemies (non-white immigrants, Daësh, Cohen's father-in-law)
- lost a suit over running a fraudulent university, which was subsequently shut down
- ran a fraudulent charity which was subsequently shut down
- makes pledges to charities, then is not forthcoming
- draft dodger ("Captain Bone Spurs")
- secretive: won't divulge tax records, business records, academic records, or full medical profile
- has a small vocabulary
- claims to have coined words long in use
- suggested that the "oranges" (origins) of the Mueller investigation should be investigated
- "confefe" (C)
- misspells many words that children can spell, including his own wife's name (C+)
- in 2008 he said, "I don’t know what the 13 stripes [on the U.S. flag] represent."
- couldn't remember words to "God Bless America" or the National Anthem (C+)
- frequently disoriented or unaware of his situation
- lifted sanctions on certain Russian oligarchs without their satisfying the conditions for the removal of those sanctions
- allowed a sanctioned Russian oligarch to meet in the U.S. with members of his staff
- is the butt of public laughter and scorn at the U.N. and elsewhere
- gave security clearances to relatives and others deemed unfit by the authorities who otherwise decide these matters (C+)
- initially said that the Mueller report should be publicly released, then reversed tack and said that it shouldn't be; initially said that Mueller should testify before Congress, then reversed tack and said that he shouldn't
- thought Frederick Douglass was still alive
- keeps insulting John McCain (C)
- outrageous claims: some doctors "don’t mind executing babies after birth"
- outrageous claims: "birtherism" (C)
- outrageous claims: Mexico would pay for the wall
- outrageous claims: Obama secretly taped him
- outrageous claims: 5 million people voted illegally (C)
- outrageous claims: wind turbines cause cancer
- outrageous claims: Democrats colluded with the Russians
- xenophobic, homophobic, Islamophobic, racist
- gave a speech about a sex boat to boy scouts (C)
- his relationship to his daughter Ivanka has sexual overtones
- presents junk food buffets to elite athletes
- swears at publicly broadcasted campaign rallies
- engages in childish behavior
- disruptive and aggressive handshakes
- lack of self-control
- pathological liar (C)
- lazy
- hypocritical
- vain
- a braggart
- condescending
- jealous
- rude and inconsiderate
- petty and peevish
- "touchy," "thin-skinned"
- stubborn, "pig-headed"
- vindictive
- venal
- chronic bad hair days
- can't close an umbrella (C)