If Trump were involved with Brexit, would he insist on a hard infrastructure (a wall perhaps) on the Irish border? One senses that in his way of thinking it would be the only way of keeping out illegal immigrants.
Paradoxically it is the hard right populists and Brexiteers who are moving heaven and earth trying to persuade the Government and the electorate that in the event of "no deal", no border of any kind would be required.
Would the Owen Patersons and Ian Duncan Smiths of this world care to speak up and confirm this?
Edit (17.51hrs GMT 4 Jan 2019).
Almost all responders and commenters so far have missed the point to the question. It concerns the putative deal which Theresa May is to do with the EU concerning the UK's withdrawal from the EU.
Almost everyone in the UK agrees that it is undesirable for there to be a "hard border" between Northern Ireland and the ROI. (This has to do with the history of "the troubles") However the "deal" would provide that in the event that the UK and the EU had not reached agreement on a trade deal by 31 Dec 2020, that the UK mainland would remain in the Customs Union, and Northern Ireland (only) in the Single Market. Failing agreement on that there would have to be a "hard border" in Ireland to administer customs duties, and migration.
Equally if the UK crashes out in March with "no deal", there will be no transition period and this will immediately give rise to the need for a hard border.
Now, the Brexiteer wing of the Tory party argue that a hard border would be unnecessary - that all movements could be tracked electronically. So what I am asking is why they don't tell Trump that he doesn't need a wall. Surely all these migrants can be tracked "electronically", can't they?