David Davis in his Brexit speech in Munich says:

“The border issue is eminently solvable if the political will is there. I do question, therefore, why it has become so intractable. It seems to me this issue has become the proxy for the negotiations as a whole. Why? Perhaps as a way to keep us tied to the single market and the customs union; perhaps to punish us for leaving; or perhaps it has more to do with internal Irish politics.

In any case, the heads of both the British and Irish customs authorities have told us that a hard border is not necessary. Jean-Claude Juncker, Leo Varadkar and Theresa May have all said that they would never enforce one.

There will be no hard border between the Republic of Ireland and Northern Ireland. It’s that simple.”

He’s not wrong…