He's the ultimate snake oil salesman.
Back in the early 1900s, travelling salesmen would sell "miracle cures" to naive country folk. Said remedies did absolutely nothing, of course, except leave the victim poorer and still sick.
Trump is exactly the same.
A liar and braggart. Promised to "drain the swamp" when in fact he's the biggest alligator ever to inhabit any level of government.
Promised to "make America great again" and has only made it worse.
Promised to make ordinary people's lives better and has only raised prices, lowered healthcare, and made billionaires richer.
Promised to start no wars and has invaded multiple countries.
A rapist, fraudulent, morally (and multiple financially) bankrupt huckster who has fooled the religious into believing he's god's choice.
Someone totally devoid of tact, empathy, diplomacy or character.
In fact, if you were to say "Apart from death row inmates, who is the public figure with the least Presidential qualities?", the answer would be "Donald Trump".