Oh, those walls that Francis began building when he became Pope 1,100 years ago?

I highly doubt that DJT will approve of the fact that the Vatican is wide open to anyone who wants to walk in along the Via della Conciliazione or other entrances - no border guards, no customs officials, nothing.

There are metal detectors for entry into St. Peter's and some other buildings, of course, because the Vatican doesn't have laws recognizing private ownership of firearms.