The heaven-sent 'doctor' Donald Trump (is he Jesus?*) may well be a megalomaniac (it usually takes one to know one, in my not so humble opinion), which, however (much to his annoyance, no doubt) does not earn him an entry into the Guinness Book of Records.
Another one has already beaten him to it, a wicked and deluded pope who has declared himself to be God on earth, viz. Boniface VIII (https://www.papalencyclicals.net/bon08/b8unam.htm). It took a French king to prove him wrong. Dante went further and consigned him to one of the lowest circles of hell. And let us not even mention the Babylonian Captivity (1309-1377), which made a total mockery of Petrine succession!
It is well known that the present pope sees himself as anti-Trump and 'anti-Christ' (the Greek preposition means 'in the place of' or 'opposed to', as Protestants would prefer), but also more significantly, ruler over the whole church (which also includes purgatory, hence Martin Luther). Trump's powers do not extend that far, in case no one knew that!
As to the present pope, of such men Gregory the Great tells us that "I confidently say that whosoever calls himself, or desires to be called, Universal Priest, is in his elation the precursor of Antichrist, because he proudly puts himself above all others."
Donald Trump does, indeed, have God-given (but unlike the pope, limited) power over others, for a little while (and not over my eternal destiny), but what is all that compared to men who claim to have miraculous powers (not even granted to St. Peter) over the elements at holy communion when Christ is being re-crucified? I have commented elsewhere on the pernicious doctrine transubstantiation (https://found21.blogspot.com/2019/08/15-questions.html) first officially formulated in 1215.
Well may we ask, who is Donald Trump, or for that matter, any of us, compared to the pope? Mere underlings? Willing ones, too? No, no, no, as one politician taught me to say when it comes to abuse of power!
* And just a reminder, if one is needed, Donald Trump is not Jesus, and neither is any pope, let alone any wafer-god! One does not speak of God by speaking about man with a loud voice!
