British Prime Minister Theresa May is to deliver a speech, finally outlining her vision on how Britain will leave the European Union.
All the indications are that she wants Britain to go 'full Brexit' - here's five things to look out for.
1. Theresa May is expected to say Britain will not have “partial” membership of the EU “that leaves us half-in, half-out”. This will please the UK's Eurosceptics. It's going to be a hard Brexit.
2. Border control is expected to be central to Ms May's strategy. This obviously has implications for our border with Northern Ireland amid fears of new controls and tariffs on goods. It will be interesting to see if she references the situation in Ireland.
3. It's not clear what her plans are for a post Brexit immigration policy but it'll be at the forefront of the minds of Irish citizens living and working in Britain. It's understood that she favours a work permit system, meaning EU migrants will only be able to come to the UK to live or work if they have a job offer. We'll have to wait an see what she says.
4. Taoiseach Enda Kenny takes leaders questions in the Dáil at 2pm. It's likely that he'll be asked about Brexit and may offer the first official Irish response to Ms May's speech.
5. It'll be early morning in New York when the British Prime Minister is speaking. US President-elect Donald Trump may not be watching live. But keep an eye out on Twitter as the afternoon wears on. Trump, a fan of Brexit, is unlikely to remain silent on his favourite social media platform.