A Donald Trump piace questa frase.
"Piacere" works in reverse - it means "to be pleasing (to someone)". So, the subject of the sentence is the thing that is pleasing, not the person being pleased. And it has to be "a" + the person if you're actually using their name. Otherwise you either use the indirect pronoun (in this case, gli) or the stressed form of the pronoun with "a" (here, a lui).
So your options in this case would be as above, or if you already know who you're talking about, Gli piace questa frase. If you want to emphasize that he might like it but probably not others, A lui piace questa frase. Saying the second one is kind of like saying "Gli piace questa frase, ma a me no."
we just had a sentence before this that said....."vicinA" is Neighbor. So that means the plural of an A ending feminine word would now end in E.
WHY is this plural used as "vicinI" .... The singular was not VicinO before.... Besides vicino means near or nearby.
I would think this should be "vicinE" = Plural of a Feminine A ending word.???