In the end, the competition will narrow down to:
Darth Vader
Pros (in Trump's eyes): evil and thoroughly corrupt
Cons: not motivated by money
Quark the Ferengi
Pros: As with all Ferengi, is motivated only by the acquisition of money
Cons: As with all Ferengi, isn't likely to turn the money he acquires over to Trump
Marvin the Martian
Pros: Wants more than anything to start an interstellar war
Cons: May be the only creature in the galaxy who's even stupider than Donald Trump
Jabba the Hutt
Pros: Shaped surprisingly like Donald Trump
Cons: Probably smells bad, and isn't amoral enough to work for Fearless Leader
HAL-9000
Pros: We don't have to pay him
Cons: We do have to watch him, lest he gets a wild hair up his ass and cancels Trump's latest KFC order
One of the Bugs from Starship Troopers
Pros: Uhh...let's skip to the cons
Cons: "Doesn't look good in a suit" is the least of our worries
An Alien from Independence Day: ID4
Pros: Hell-bent on galactic conquest
Cons: Won't hesitate to fry Trump with Y-rays after Trump pisses him off