I don't think the visit to Ireland is a full on state visit.
Trump is basically hoping to give his Doonbeg golf links a bit of publicity.
This is the money-losing venture that is slowly being reclaimed by the Atlantic Ocean thanks to global warming. He wanted the government to provide funds for... a wall, to stop the erosion. Locals registered an objection to this on environmental grounds as the area is the habitat of a rare snail.
Local farmers have been asked to refrain from slurry spreading and grass cutting while 45 is playing golf.