Mary Lou McDonald accused Boris Johnson of following a Brexit “fantasy” and said his plan for leaving the EU is “immeasurably dangerous”.
The party said a failure to hold a vote on Irish reunification in the event of a no-deal Brexit would be “unthinkable”.
Boris Johnson has met with senior DUP figures in Northern Ireland in an effort to continue the deal keeping his government in power.
An agreement has been reached to establish a new round of talks between the main parties in Northern Ireland, it has been announced.
Theresa May and Jeremy Corbyn have missed Prime Minister’s Questions to attend the funeral of Lyra McKee who was killed during gunfire in Northern Ireland.
Two men have been arrested on suspicion of manslaughter by police investigating the deaths of three teenagers outside a St Patrick's Day disco, police said.
Two 17-year-olds and a 16-year-old have died following a crush at a disco, after a "large crowd" tried to get into the venue.
Defence Secretary Gavin Williamson has confirmed the Ministry of Defence would support a British soldier facing murder charges from 1972.
Sammy Wilson, the DUP’s Brexit spokesman has accused the head of Northern Ireland’s civil service of being “politically motivated” after he warned against no-deal Brexit.
Secretary of State Karen Bradley has said she has no powers to make changes to Northern Ireland's laws after protesters called on her to decriminalise abortion.
Protesters representing both sides of the debate on abortion in Northern Ireland have gathered outside the Houses of Parliament in London.
Northern Ireland's public water company is stockpiling purification chemicals ahead of Brexit.
Sammy Wilson, DUP’s Brexit spokesman has said that “there is absolutely no reason that leaving the EU should take us back” to the Troubles in Northern Ireland.
Theresa May will insist that she will deliver a Brexit deal that “honours our commitments to Northern Ireland”, admitting that she knew it was a “concerning time”.
Former Northern Ireland first minister Lord Trimble is threatening to take the government to court over the controversial Brexit backstop.
Conservative Lord Robert Hayward has said that he tabled an amendment to extend equal marriage to Northern Ireland because the UK “can’t wait forever for the Northern Irish Assembly to come back together”.
Prime Minister Theresa May has assured MPs that they would get a vote on triggering the backstop, or extending the implementation period, if there is no new agreement by December 2020.
Around 1,000 police officers from England and Scotland are to begin training this month for deployment in Northern Ireland, in case of disorder in the event of a no-deal Brexit.
The DUP's Brexit spokesman says the party will not support Theresa May's deal
An anti-Brexit demonstration has taken place at the Irish border, led by Faux BoJo, a professional Boris Johnson lookalike, and EU Supergirl.
The Prime Minister has rejected accusations that she allowed the European Union to use the issue of a hard border between Ireland and Northern Ireland as a “negotiating play”.
The Democratic Unionist Party’s Education Minister Peter Weir has said that unless “something very strange” happens, the Government will lose the meaningful vote on Theresa May’s EU Withdrawal Agreement next week, potentially “by a large margin”.
Simon Doherty of the British Veterinary Association tells Eamonn Holmes that dogs may find it harder to go to Donegal for the weekend
Conservative MP Damian Green has said that “no government has ever published legal advice” and that it was “not going to happen”, after former Brexit Secretary David Davis called for Theresa May to publish the legal advice given to the Government on the Irish backstop.
Downing Street has released a statement saying the Prime Minister and Irish Premier had agreed the backstop should “only be a temporary arrangement”, but Leo Varadkar said he would not accept a Brexit deal which gives the UK unilateral power to halt the backstop.
The Taoiseach of Ireland Leo Varadkar has said the lack of agreement over a workable Irish Border solution for Brexit is 'fraying relationships' between the UK and Ireland
A Sinn Fein MP has accused Brexit Secretary Dominic Raab of "running away" from people living in a border town during his visit to Northern Ireland.
Evangelical Peter Lynas has said that the “gay cake” case was “about the message and not the people” after Christian owners of a bakery won their Supreme Court appeal.
Prime Minister Theresa May’s stern statement to the European Union has been praised by DUP Deputy Leader Nigel Dodds.
The European Union’s Chief negotiator Michel Barnier has said he is read to come forward with an “improved” proposal for the Irish border.
The senior civil servant running Northern Ireland’s public services has said that the region could collapse if there was a no deal Brexit.
Brian McFadden has said that he has “a strong feeling” that Brexit could force a united Ireland because “most people in Northern Ireland don’t want Brexit”.
Conservative Brexiteers have released proposals which they believe could allow the UK to leave the EU’s single market and customs union without the need for a hard border in Ireland.
Prime Minister Theresa May retains confidence in Karen Bradley despite her admission that she did not initially understand Northern Irish politics, Number 10 said.
Theresa May will use a speech in Belfast to reiterate her refusal to contemplate any backstop deal that treats Northern Ireland differently from the rest of the UK
Seven Supreme Court justices in London will announce their decision on Thursday, at a time of intense political debate on the issue
Northern Ireland could be given joint EU and UK status and a "buffer zone" on its border with the Republic, under new plans being drawn up by the Brexit Secretary, according to reports.
After the Republic of Ireland voted to repeal the Eighth Amendment, MPs are calling for Northern Irish women to have access to abortion
Labour leader Jeremy Corbyn will make his first visit to Northern Ireland to set out Labour's position on Brexit, and his views on Irish reunification
'One of the most important amendments of the entire process', says shadow Brexit minister
The Good Friday Agreement was signed 20 years ago and Bertie Ahern was one of its key figures
The comments are being investigated to establish whether they are a breach of contempt of court laws
The Royal couple will have lunch at the Crown Liquor Saloon and then go on a walkabout outside the building
It is thought the air pocket may have been caused by a benign bone tumour
Villiers says Theresa May is 'absolutely the right person' to lead Britain
The Brexit Secretary had said over the weekend last Friday's EU agreement was a 'statement of intent', which the Irish branded to be 'bizarre'
Temperatures dropped below freezing in many parts of the country
Up to 20 centimetres (eight inches) of snow could fall on Monday as the storm keeps its grip on the country
Simon Coveney said Ireland supports the talks moving to the next phase of negotiation on Twitter
Brexiteer Richard Tice isn't exactly impressed with today's deal