We sat down with Tánaiste Simon Harris

And the big story of the day is the serious disorder in Belfast last night.

We know that a man has been charged over the knife attack that left another man with serious injuries injured.

which led to last night's scenes.

Now, the PSNI have said that the suspect is understood to have travelled to Northern Ireland from Dublin.

He entered the UK from Ireland.

Without getting into details of this specific case, does this raise questions that the Irish government needs to answer about who's coming through and how?

Well, a couple of things.

I mean, I think firstly, it's always been known that it's really important that the two governments work closely when it comes to the issue of migration, because we share a common travel area, something that I think people in this country very much cherish, something that's really important, something that's allowed free movement across the island.

Nobody wants to see a hard border on the island of Ireland, far from it.

But it does show the importance in a broader sense, because I don't want to comment on the specific case.

But it does show the broader need to continue to work very closely together, as I know the Minister for Justice does and the Home Secretary as well, because migration policies in one country can in many ways have a knock on impact on another.

And of course, that common travel area, which was never meant to be for migration, of course, meant to be for citizens of both Ireland and the UK.

So you don't think that's under threat, that there's no threat to the common travel area, despite a lot of the front pages in the UK today are very strong about, in this case, how somebody was able to travel?

I don't think so at all, because I think the benefits of the common travel area are immense.

But I mean, I think it does show the need for very, very close ongoing cooperation around issues to do with migration.

But can I also just take a step back and say, I mean, that obviously what we saw in terms of that violent, horrific attack in It's just, it's beyond words.

But at the same time, conscious that that will go before a criminal justice system.

Conscious that somebody has been charged, I think, today in relation to that.

And we obviously have to let that run its course.

And I have every confidence the criminal justice system will do its job in relation to that.

But what we saw last night... was beyond chilling.

The idea that we had masked men on the streets of Northern Ireland, looking for people on the basis of their race or ethnicity.

It's anti-vigil, it's vigilante behavior.

burning houses, burning buses.

And I just think that, in fact, I don't think any of us can even fully comprehend the fear that that must have caused for so many innocent people and indeed so many children.