Dictators are best known for reassigning government money or assets to them self or their allies, imprisoning their political opponents, journalist opponents, puppet "kangaroo" court systems, and rigging elections. Trump has low marks on all these indicators. Not only that, but Trump seems to have actually put massive amounts of his money and assets at risk of being seized by political opponents when they actually used the court system against him in their own puppet courts, which suggests the opposite... that he is fighting against authoritarian opponents. Furthermore, roughly 25% of his political opponents have admitted in surveys they want him to be murdered as evidenced by being shot in the ear by a missed bullet. And of course he has drawn attention to unfair election tactics such as high-risk mail-in voting systems and high-risk electronic voting systems which have shown them selves to be easily exploited.

By that metric set the only US president to have scored substantially may have been Lincoln because of his clear imprisonment of opponents such as journalists, but he isn't known for having lined his pockets with government assets to my knowledge or rigged elections. Of course Biden had his primary political opponent arrested, which was a genuine a shift for the USA away from Democracy and towards dictatorship... that was the most dictatorial behavior ever exhibited in USA history I'm aware of, though viewed in context it wasn't as bad as Lincoln's behaviors.

Trump does show plenty of signs of being an authoritarian, which is common for centrists like the Clintons for example. The most authoritarian part of Trump's presidency is his increased usage of executive orders to accomplish agenda items, suggesting a desire for much more power than in the past. What people don't understand most is that Hitler was a centrist, picking both left-wing and right-wing concepts for his power as National Socialism. Socialism is a far-left position by definition to most people. And, socialism is a relative of fascism because it distances itself from communism by enabling high-regulation private enterprise.

The vast majority of presidents in US history would be fine with accepting any amount of authority given to the office, and be happy to exercise that authority. So many of them wanted to be dictators whether or not they acted as such. Obviously there are exceptions, starting with the starting president.

Both authoritarianism and libertarianism are centrist ideas. People are quite mistaken that because they are moderates, they are not extreme. Pragmatism most often exists because there are no principles or moral values of the person. What is considered "extreme" is entirely subjective. But still, I've offered five indicators of what other people have noticed about what they consider to be dictators and I think they are all sufficient when put together for a proper identity.

Of course the only political scope more authoritarian than nationalism is globalism, which is at the moment a feature of the left, though certainly there could be right wing brands of that possible.