Trump is a "common sense conservative" and that is not politically correct because it is not allowed by the Establishment.
So Trump wants to end illegal immigration but that is not allowed, not politically correct, so Trump's Wall is not politically correct. The Establishment see how popular Trump is because he defies them and dares to be politically incorrect, so they send the Pope in on him to spell out how the Wall is not politically correct, to such an extent that the Pope implies that Trump is not Christian. It is desperation on their part.
Being against the global warming agenda is not allowed, it is not politically correct. Trump, being common sense, is obviously against it. So my guess is that they will have to send the Pope in on him on that one later in the election cycle.
But the problem they have got is that lots of Catholics are against illegal immigration and don't believe in man-made global warming, so the Pope ends up looking like part of the liveral Establishment and ultimately that is not good for the Catholic Church since a lot of catholics are in fact conservative.
Pat Buchanan is as catholic as it gets, but he is against illegal immigration and my guess is he doesn't believe in global warming and he is a fan of Trump. Therefore he is a real conservative and not politically correct.
When they have to get the Pope to intervene in politics, you know they are desperate..